Best Free Component Libraries
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Compare the Top Free Component Libraries as of April 2025
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What are Free Component Libraries?
Component libraries are preconfigured sets of components, designs, styles, and code that enable developers and designers to build and design applications in a more efficient and streamlined way. A component library, also known as a UI component library, can be used across programming languages and frameworks to speed up and simplify design and development. Compare and read user reviews of the best Free Component Libraries currently available using the table below. This list is updated regularly.
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1
Onsen UI
Onsen UI
Experience streamlined development with zero-time setup, using the technologies you already know and love - Javascript, HTML and CSS. Worried that PhoneGap / Cordova apps are slow? Fear not! All animations in Onsen UI have been tuned and optimized to perform well on a wide range of devices. We take great care to ensure that apps made using Onsen UI feel smooth even on lower end devices. Onsen UI is easy to learn while being a powerful tool to create complex mobile apps. We have lots of learning resources including official documentation, an interactive tutorial and a community forum where your questions get answered. A rich variety of UI components specially designed for mobile apps. Onsen UI provides tabs, side menu, stack navigation and tons of other components such as lists and forms.Starting Price: Free -
2
cryptography
cryptography
cryptography includes both high-level recipes and low-level interfaces to common cryptographic algorithms such as symmetric ciphers, message digests, and key derivation functions. Encrypt with cryptography’s high-level symmetric encryption recipe. cryptography is broadly divided into two levels. One with safe cryptographic recipes that require little to no configuration choices. These are safe and easy to use and don’t require developers to make many decisions. The other level is low-level cryptographic primitives. These are often dangerous and can be used incorrectly. They require making decisions and having an in-depth knowledge of the cryptographic concepts at work. Because of the potential danger in working at this level, this is referred to as the “hazardous materials” or “hazmat” layer. These live in the cryptography.hazmat package, and their documentation will always contain an admonition at the top.Starting Price: Free -
3
python-docx
python-docx
python-docx is a Python library for creating and updating Microsoft Word (.docx) files. Paragraphs are fundamental in Word. They’re used for body text, but also for headings and list items like bullets. You’re free to specify both width and height, but usually, you wouldn’t want to. If you specify only one, python-docx uses it to calculate the properly scaled value of the other. This way the aspect ratio is preserved and your picture doesn’t look stretched. If you don’t know what a Word paragraph style is you should definitely check it out. Basically, it allows you to apply a whole set of formatting options to a paragraph at once. python-docx allows you to create new documents as well as make changes to existing ones. Actually, it only lets you make changes to existing documents; it’s just that if you start with a document that doesn’t have any content, it might feel at first like you’re creating one from scratch.Starting Price: Free -
4
django-mysql
django-mysql
Django-MySQL extends Django’s built-in MySQL and MariaDB support their specific features not available on other databases. A new cache backend that makes use of MySQL’s upsert statement and does compression. Named locks for easy locking of e.g. external resources. Extra checks added to Django’s check framework to ensure your Django and MySQL configurations are optimal. Django-MySQL comes with a number of extensions to QuerySet that can be installed in a number of ways - e.g. adding the QuerySetMixin to your existing QuerySet subclass.Starting Price: Free -
5
React Bootstrap
React Bootstrap
The most popular front-end framework rebuilt for React. React-Bootstrap replaces Bootstrap JavaScript. Each component has been built from scratch as a true React component, without unneeded dependencies like jQuery. As one of the oldest React libraries, React-Bootstrap has evolved and grown alongside React, making it an excellent choice as your UI foundation. Built with compatibility in mind, we embrace our bootstrap core and strive to be compatible with the world's largest UI ecosystem. By relying entirely on the Bootstrap stylesheet, React-Bootstrap just works with the thousands of Bootstrap themes you already love. The React component model gives us more control over form and function of each component. Each component is implemented with accessibility in mind. The result is a set of accessible-by-default components, over what is possible from plain Bootstrap.Starting Price: Free -
6
requests
Python Software Foundation
Requests is a simple, yet elegant, HTTP library. Requests allows you to send HTTP/1.1 requests extremely easily. There’s no need to manually add query strings to your URLs, or to form-encode your PUT & POST data, but nowadays, just use the JSON method! Requests is one of the most downloaded Python packages today, pulling in around 30M downloads/week, according to GitHub, Requests is currently depended upon by 1,000,000+ repositories. You may certainly put your trust in this code. Requests is available on PyPI. Requests is ready for the demands of building robust and reliable HTTP–speaking applications, for the needs of today. Automatic content decompression and decoding. International domains and URLs. Sessions with cookie persistence. Browser-style TLS/SSL verification. Basic & digest authentication, and familiar dict–like cookies. Multi-part file uploads. SOCKS proxy support. Connection timeouts and streaming downloads.Starting Price: Free -
7
Selenium WebDriver
Selenium
Selenium WebDriver drives a browser natively, as a real user would, either locally or on remote machines. WebDriver is simple, it is designed as a concise and compact programming interface. Through a simple setup, WebDriver can be used with all major browsers. Automate real user interactions in Firefox, Safari, Edge, Chrome, Internet Explorer and more! Selenium WebDriver refers to both the language bindings and the implementations of the individual browser controlling code. This is commonly referred to as just WebDriver. The W3C is an international community that works to develop Web standards. In June 2018, WebDriver became a W3C recommendation. Major browser vendors (Mozilla, Google, Apple, Microsoft) support WebDriver and work constantly to improve the browsers and browser controlling code, which leads to a more uniform behavior across the different browsers, making your automation scripts more stable.Starting Price: Free -
8
Semantic UI React
Vercel
Semantic UI React is the official React integration for Semantic UI. jQuery-free, declarative API, augmentation, shorthand props, sub-components, auto controlled state. jQuery is a DOM manipulation library. It reads from and writes to the DOM. React uses a virtual DOM (a JavaScript representation of the real DOM). React only writes patch updates to the DOM, but never reads from it. It is not feasible to keep real DOM manipulations in sync with React's virtual DOM. Because of this, all jQuery functionality has been re-implemented in React. Control the rendered HTML tag, or render one component as another component. Extra props are passed to the component you are rendering as. Augmentation is powerful. You can compose component features and props without adding extra nested components. Shorthand props generate markup for you, making many use cases a breeze. All object props are spread on the child components.Starting Price: Free -
9
Grommet
Grommet
Build responsive and accessible mobile-first projects for the web with an easy-to-use the component library. A function that recieves two theme objects and returns a theme object that includes both theme values. In case different styling are found for the same components on the two themes, the second argument theme will determine the styling. Tailor composite components with grommet. embrace atomic design methods and build a library that fits your needs. Keyboard navigation, screen reader tags, and more. grommet provides support for W3c’s WCAG 2.1 spec out of the box. Support all the devices! use Flexbox and CSS Grid to provide layouts for all those new phones and widescreen displays.Starting Price: Free -
10
urllib3
urllib3
urllib3 is a powerful, user-friendly HTTP client for Python. Much of the Python ecosystem already uses urllib3 and you should too. urllib3 brings many critical features that are missing from the Python standard libraries. Thread safety, connection pooling, client-side TLS/SSL verification. File uploads with multipart encoding. Helpers for retrying requests and dealing with HTTP redirects. Support for gzip, deflate, and brotli encoding. Proxy support for HTTP and SOCKS. 100% test coverage. urllib3 is one of the most downloaded packages on PyPI and is a dependency of many popular Python packages like Requests, Pip, and more! urllib3 is made available under the MIT License. The API Reference documentation provides API-level documentation. The User Guide is the place to go to learn how to use the library and accomplish common tasks. The more in-depth Advanced Usage guide is the place to go for lower-level tweaking.Starting Price: Free -
11
MPI for Python (mpi4py)
MPI for Python
Over the last years, high performance computing has become an affordable resource to many more researchers in the scientific community than ever before. The conjunction of quality open source software and commodity hardware strongly influenced the now widespread popularity of Beowulf class clusters and cluster of workstations. Among many parallel computational models, message-passing has proven to be an effective one. This paradigm is specially suited for (but not limited to) distributed memory architectures and is used in today’s most demanding scientific and engineering application related to modeling, simulation, design, and signal processing. However, portable message-passing parallel programming used to be a nightmare in the past because of the many incompatible options developers were faced to. Fortunately, this situation definitely changed after the MPI Forum released its standard specification.Starting Price: Free -
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NumPy
NumPy
Fast and versatile, the NumPy vectorization, indexing, and broadcasting concepts are the de-facto standards of array computing today. NumPy offers comprehensive mathematical functions, random number generators, linear algebra routines, Fourier transforms, and more. NumPy supports a wide range of hardware and computing platforms, and plays well with distributed, GPU, and sparse array libraries. The core of NumPy is well-optimized C code. Enjoy the flexibility of Python with the speed of compiled code. NumPy’s high level syntax makes it accessible and productive for programmers from any background or experience level. NumPy brings the computational power of languages like C and Fortran to Python, a language much easier to learn and use. With this power comes simplicity: a solution in NumPy is often clear and elegant.Starting Price: Free -
13
Chakra UI
Chakra UI
Chakra UI is a simple, modular and accessible component library that gives you the building blocks you need to build your React applications. Chakra UI strictly follows WAI-ARIA standards for all components. Designed with composition in mind. Compose new components with ease. We're a team of active maintainers ready to help you whenever you need. Guaranteed to boost your productivity when building your app or website. Chakra UI strictly follows WAI-ARIA standards for all components. Customize any part of our components to match your design needs. Designed with composition in mind. Compose new components with ease. Optimized for multiple color modes. Use light or dark, your choice. Guaranteed to boost your productivity when building your app or website. We're a team of active maintainers ready to help you whenever you need. An experience you'd expect from a design system.Starting Price: Free -
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Angular Material
Angular
Internationalized and accessible components for everyone. Well tested to ensure performance and reliability. Straightforward APIs with consistent cross platform behaviour. Provide tools that help developers build their own custom components with common interaction patterns. Customizable within the bounds of the Material Design specification. Built by the Angular team to integrate seamlessly with Angular. Start from scratch or drop into your existing applications. Start by creating the autocomplete panel and the options displayed inside it. Each option should be defined by a mat-option tag. Set each option's value property to whatever you'd like the value of the text input to be when that option is selected.Starting Price: Free -
15
Beautiful Soup
Beautiful Soup
Beautiful Soup is a library that makes it easy to scrape information from web pages. It sits atop an HTML or XML parser, providing Pythonic idioms for iterating, searching, and modifying the parse tree. Beautiful Soup's support for Python 2 was discontinued on December 31, 2020: one year after the sunset date for Python 2 itself. From this point onward, new Beautiful Soup development will exclusively target Python 3. The final release of Beautiful Soup 4 to support Python 2 was 4.9.3. Beautiful Soup is licensed under the MIT license, so you can also download the tarball, drop the bs4/ directory into almost any Python application (or into your library path) and start using it immediately.Starting Price: Free -
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MUI offers a comprehensive suite of UI tools to help you ship new features faster. Start with Material UI, our fully-loaded component library, or bring your own design system to our production-ready components. Build at an accelerated pace without sacrificing flexibility or control. Every component you need is ready for production. Build beautiful UIs with ease. Start with Google's Material Design, or create your own sophisticated theme. Our components are as flexible as they are powerful. You always have full control over how they look and behave. We believe in building for everyone. That's why accessibility is one of our highest priorities with every new feature we ship. Find out why MUI's tools are trusted by thousands of open source developers and teams around the world. Get a growing list of components, ready-to-use, free forever, and with accessibility always in mind. We've built the foundational UI blocks for your design system so you don't have to.Starting Price: $15 per month
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Appsmith
Appsmith
Appsmith is a low code developer tool for quickly building UIs and connecting to a wide range of data sources. You can drag and drop pre-built components to build UI on the open grid-style canvas. When it comes to adding logic, transforming data, and defining workflows. Appsmith lets you insert plain Javascript right inside any widget, query, or almost any other setting. - Start by linking to an existing datasource such as a database or an API. Appsmith has plug-and-play support for most databases, Rest APIs, and GraphQL, so you can seamlessly import your data. - Next, you can use pre-made widgets to easily layout an app, and move them around to optimize usability - Get the app running by connecting the UI to the datasource. You can do this by writing queries or calling APIs. Remember, you can control everything with JavaScript! - Finally, deploy the app. You can also integrate with your CI/CD, create git branches for different environments to safely develop, test and deployStarting Price: $0.4/hour/user -
18
Zeroheight
zeroheight
zeroheight helps teams create, manage and maintain their design systems. Using zeroheight, designers, engineers, and product teams can collaborate and build design systems that can be easily shared across teams. Create a centralized repository of styles, tokens, guidelines, code, components, and patterns, integrated and synced between the tools you already use. zeroheight makes maintaining consistency across different products easier and reduces the time and effort needed to stand up new brands and products confidently. We offer features that suit teams from startup to enterprise, from governance to analytics to automation.Starting Price: Free -
19
Leaflet
Leaflet
Leaflet is the leading open-source JavaScript library for mobile-friendly interactive maps. Weighing just about 42 KB of JS, it has all the mapping features most developers ever need. Leaflet is designed with simplicity, performance, and usability in mind. It works efficiently across all major desktop and mobile platforms, can be extended with lots of plugins, has a beautiful, easy-to-use, and well-documented API, and a simple, readable source code that is a joy to contribute to. Leaflet doesn't try to do everything for everyone. Instead, it focuses on making the basic things work perfectly. Hardware acceleration on mobile makes it feel as smooth as native apps. Utilizing CSS3 features to make panning and zooming really smooth. Smart polyline/polygon rendering with dynamic clipping and simplification makes it very fast. The modular build system for leaving out features you don't need. Tap delay elimination on mobile.Starting Price: Free -
20
Polymer
Polymer
The Polymer library provides a set of features for creating custom elements. These features are designed to make it easier and faster to make custom elements that work like standard DOM elements. Similar to standard DOM elements, Polymer elements can be instantiated using a constructor or document creation element, configured using attributes or properties, populated with internal DOM inside each instance, responsive to property and attribute changes, styled with internal defaults or externally, and responsive to methods that manipulate its internal state. Registering an element associates a class with a custom element name. The element provides callbacks to manage its lifecycle. Polymer also lets you declare properties, to integrate your element's property API with the Polymer data system. Shadow DOM provides a local, encapsulated DOM tree for your element. Polymer can automatically create and populate a shadow tree for your element from a DOM template.Starting Price: Free -
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WinJS
WinJS
Microsoft is committed to making sure that WinJS continues to run for existing customers. At this time we don't have plans to invest in new features or feature requests. Bug fixes will be limited to correcting substantial issues that are blocking customer deployments. We may also consider bug fixes to help our customers maintain their existing WinJS-based apps. You can contribute by reviewing and sending feedback on code checkins, suggesting and trying out new features as they are implemented, submitting bugs and helping us verify fixes as they are checked in, as well as submitting code fixes or code contributions of your own. Note that all code submissions will be rigorously reviewed and tested by the team, and only those that meet an extremely high bar for both quality and design appropriateness will be merged into the source.Starting Price: Free -
22
Onymos
Onymos
Time to market can make or break any app dev project. Yet many enterprises, agencies, and developers slow innovation by burning countless hours building core functionality from scratch and extending development timelines. When you can get the Features your app needs out of the box, development begins with the foundation already in place, and you can move fast from day one. Cut development time by as much as 80%. You can deploy in days, not months when you build your app with ready-made, full-stack features from Onymos. The average Onymos feature has over a thousand hours of development time, and that number’s only getting bigger. When software or APIs get updated, our features do too. UI/UX, front-end logic, and integrated cloud services like Stripe, APNs, and Amazon S3. When you use Onymos Features, you get it all. Companies like Albertsons, CVS Pharmacy, and Walmart are already building their apps with Onymos.Starting Price: $0.60 per month -
23
openpyxl
openpyxl
openpyxl is a Python library to read/write Excel 2010 xlsx/xlsm/xltx/xltm files. It was born from a lack of an existing library to read/write natively from Python in the Office Open XML format. All kudos to the PHPExcel team as openpyxl was initially based on PHPExcel. By default, openpyxl does not guard against quadratic blowup or billion laughs XML attacks. To guard against these attacks install defusedxml. Install openpyxl using pip. It is advisable to do this in a Python virtualenv without system packages. Sometimes you might want to work with the checkout of a particular version. This may be the case if bugs have been fixed but a release has not yet been made. There is no need to create a file on the filesystem to get started with openpyxl. Just import the Workbook class and start work. Sheets are given a name automatically when they are created. Once you gave a worksheet a name, you can get it as a key of the workbook.Starting Price: Free -
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OpenTuner
OpenTuner
Program autotuning has been demonstrated in many domains to achieve better or more portable performance. However, autotuners themselves are often not very portable between projects because using a domain-informed search space representation is critical to achieving good results and because no single search technique performs best for all problems. OpenTuner is a new framework for building domain-specific multi-objective program autotuners. OpenTuner supports fully customizable configuration representations, an extensible technique representation to allow for domain-specific techniques, and an easy-to-use interface for communicating with the tuned program. A key capability inside OpenTuner is the use of ensembles of disparate search techniques simultaneously, techniques that perform well will receive larger testing budgets, and techniques which perform poorly will be disabled.Starting Price: Free -
25
Oracle ADF Faces
Oracle
Faster, simpler, and richer user interface development Oracle ADF Faces components is a set of over 150 Ajax-enabled JSF components that let you build a richer web user interface for Java EE applications. Oracle ADF Faces components are free to develop and deploy through Oracle ADF Essentials. Over 150+ AJAX-enabled components. Extensive data visualization components, with JSF 2 support. Complete JavaScript API. Drag and drop framework. Dialog and popup framework. Navigation menu framework. Internationalization and accessibility support. Tablet/touch gesture support. Declarative partial page rendering. Support for skinning. Support for page templates, reusable page regions, and declarative components. Support for the Oracle Alta UI. Integration with ADFc to support TaskFlows and bookmarking. Integration with ADFm to support data bindings. Oracle ADF security support.Starting Price: Free -
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Oracle Data Access Components (ODAC) are a set of Windows and .NET data access drivers and tools. They include support for .NET data access, Microsoft Visual Studio tools for developing Oracle database applications; and ASP.NET providers. ODAC provides comprehensive client support for advanced Oracle database functionality, including performance, high availability, and security, among other features. It is tightly integrated with Visual Studio to provide a seamless development experience for developers. Oracle Data Provider for .NET is an implementation of Microsoft's ADO.NET interface and provides access to Oracle databases. OLAP Data Manipulation Language (OLAP DML) is used to define and manipulate analytic workspace objects. High performance, a feature-rich mechanism for Microsoft ADO and OLE DB data access to Oracle databases, its usage, and its configuration. Provides introductory, installation, post-installation configuration, and usage information.Starting Price: Free
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parsel
Python Software Foundation
Parsel is a BSD-licensed Python library to extract and remove data from HTML and XML using XPath and CSS selectors, optionally combined with regular expressions. Create a selector object for the HTML or XML text that you want to parse. Then use CSS or XPath expressions to select elements. CSS is a language for applying styles to HTML documents. It defines selectors to associate those styles with specific HTML elements. XPath is a language for selecting nodes in XML documents, which can also be used with HTML. You can use either CSS or XPath. CSS is usually more readable, but some things can only be done with XPath. Being built atop lxml, parsel selectors support some EXSLT extensions and come with pre-registered namespaces to use in XPath expressions. Parsel selectors allow you to chain selectors, so most of the time you can just select by class using CSS and then switch to XPath when needed.Starting Price: Free -
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pexpect
pexpect
Pexpect makes Python a better tool for controlling other applications. Pexpect is a pure Python module for spawning child applications; controlling them, and responding to expected patterns in their output. Pexpect works like Don Libes’ Expect. Pexpect allows your script to spawn a child application and control it as if a human were typing commands. Pexpect can be used for automating interactive applications such as ssh, FTP, passwd, telnet, etc. It can be used to automate setup scripts for duplicating software package installations on different servers. It can be used for automated software testing. Pexpect is in the spirit of Don Libes’ Expect, but Pexpect is pure Python. Unlike other Expect-like modules for Python, Pexpect does not require TCL or Expect nor does it require C extensions to be compiled. It should work on any platform that supports the standard Python pty module. The Pexpect interface was designed to be easy to use.Starting Price: Free -
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pygame
pygame
Pygame is a set of Python modules designed for writing video games. Pygame adds functionality on top of the excellent SDL library. This allows you to create fully featured games and multimedia programs in the python language. Pygame is highly portable and runs on nearly every platform and operating system. Pygame is free. Released under the LGPL license, you can create open-source, freeware, shareware, and commercial games with it. With dual-core CPUs common, and 8-core CPUs cheaply available on desktop systems, making use of multi-core CPUs allows you to do more in your game. Selected pygame functions release the dreaded python GIL, which is something you can do from C code. Uses optimized C and assembly code for core functions. C code is often 10-20 times faster than python code, and assembly code can easily be 100x or more times faster than python code. Comes with many operating systems. Just an apt-get, emerge, pkg_add, or just install away.Starting Price: Free -
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pyglet
pyglet
The cross-platform windowing and multimedia library for Python. pyglet is a powerful, yet easy-to-use Python library for developing games and other visually-rich applications on Windows, Mac OS X, and Linux. It supports windowing, user interface event handling, Joysticks, OpenGL graphics, loading images, and videos, and playing sounds and music. All of this with a friendly Pythonic API, that's simple to learn and doesn't get in your way. pyglet is provided under the BSD open-source license, allowing you to use it for both commercial and other open-source projects with very little restriction. No external dependencies or installation requirements. For most application and game requirements, pyglet needs nothing else besides Python, simplifying distribution and installation. This makes it easy to package your project with freezers such as PyInstaller. pyglet provides real platform native windows, allowing you to take advantage of multiple windows and multi-monitor desktops.Starting Price: Free