Compare the Top Free Application Server Software as of April 2025

What is Free Application Server Software?

Application server software provides a platform for deploying, managing, and running applications, typically for web or enterprise environments. These servers handle the backend logic of applications, facilitating the connection between client devices and databases or other services. Application servers often provide middleware services such as security, transaction management, and messaging, enabling the smooth execution of applications. They are designed to support multiple users simultaneously and ensure high availability, scalability, and performance of applications. This software is commonly used in environments where complex, data-intensive applications are developed, such as in e-commerce platforms, enterprise resource planning (ERP), and customer relationship management (CRM) systems. Compare and read user reviews of the best Free Application Server software currently available using the table below. This list is updated regularly.

  • 1
    Linx

    Linx

    Twenty57

    A powerful iPaaS platform for integration and business process automation. Linx is a powerful platform for building custom integrations at scale. The platform provides enterprise-grade capability and unparalleled flexibility to cater to a wide range of integration use cases for today’s growing businesses, including application integration, data synchronization, data migration, automations, and rapid API development and management. Linx is a low-code, desktop-based iPaaS that enables organizations to connect their cloud and on-premise applications, data sources.
    Starting Price: $599 per month
  • 2
    RasPiEsi
    RasPiEsi is The World's Smallest Open Source ERP Application Server powered by Epesi and running on Raspberry Pi Zero with 1 core and 512MB RAM only. Part of Epesi ENS - the first FOSS Enterprise Nervous System. Epesi BIM on LLMP stack: - Linux - Lighttpd - MariaDB - tuned - PHP 7.4 FPM + memcached and ZRAM neofetch, mc, ncdu added and updated 77 packages on November 4, 2023 for version 1.1 ("Józiu") RasPiEsi is the smallest possible Epesi Node I was able to build with the smallest RAM usage of only 133MB! Thanks to the excellent DietPi distro this tiny server runs Epesi surprisingly well especially on a fast SD card. It should run unmodified on any Raspberry Pi - from the lowest end $5 RPi Zero with no WiFi and 1 CPU and 512 MB of RAM (used to create this disk image), to the high end RPi 4. Tested fine on RPi 3 - unmodified, just swapped between units! MIT License • Copyright (c) 2024 by Janusz Tylek and Karina Tylek
    Starting Price: $0
  • 3
    Switchover
    We help companies in every industry to accelerate their software development processes. Our clearly arranged feature flag solution allows you to switch your features on and off at any time. Use it for User Targeting, A/B Testing, Canary Releases, Experimenting and everything else you can think of.
    Starting Price: 0,-EUR
  • 4
    Appwrite

    Appwrite

    Appwrite

    Build your entire backend within minutes with just a few lines of code using the frameworks and languages you love. Allowing you to focus on design and innovation instead of tedious and repetitive backend tasks. Products Appwrite Cloud provides you with: - Authentication: 30+ login methods, support for teams, roles, and user labels - Databases: Never paused, fast in-memory caching, advanced permission models, relationships support - Storage: File encryption at rest and transit, built-in image transformation capabilities, advanced compression with WebP/Brotli support - Functions: Automatic deployment from GitHub - Messaging: SMS, email, and push notification support - Real-time: Unlimited subscriptions By utilizing Appwrites’ features, you save time and ensure your products are stable and secure for your end users. With Appwrite, you always own your data, so you never have to fear vendor lock-in.
    Starting Price: $15 per month, per member
  • 5
    Render

    Render

    Render

    Developers have always been forced to pick between two extremes of cloud infrastructure: expensive yet inflexible platforms that fail to scale, or complex large clouds that impose steep learning curves and massive operations teams. ‍ Render offers the best of both worlds — incredible ease of use coupled with immense power and scalability to power everything from a simple HTML page to complex applications with hundreds of microservices.
    Starting Price: $19 per user per month
  • 6
    Starcounter

    Starcounter

    Starcounter

    Our ACID in-memory technology and application server enable you to build lightning-fast enterprise software. Without custom tooling or new syntax. Starcounter applications let you achieve 50 to 1000 times better performance without adding complexity. Applications are written in regular C#, LINQ, and SQL. Even the ACID transactions are written in regular C# code. Full Visual Studio support including IntelliSense, debugger, and performance profiler. All the things you like, minus the headache. Write regular C# syntax with MVVM pattern to leverage ACID in-memory technology and thin client UI for extreme performance. Starcounter technology adds business value from day one. We leverage technology that’s already developed and in production, processing millions of business transactions for high-demand customers. Starcounter combines ACID in-memory database and application server into a single platform unmatched in performance, simplicity, and price.
    Starting Price: Free
  • 7
    NGINX
    NGINX Open Source: The open source web server that powers more than 400 million websites. NGINX Plus is a software load balancer, web server, and content cache built on top of open source NGINX. Use NGINX Plus instead of your hardware load balancer and get the freedom to innovate without being constrained by infrastructure. Save more than 80% compared to hardware ADCs, without sacrificing performance or functionality. Deploy anywhere: public cloud, private cloud, bare metal, virtual machines, and containers. Save time by performing common tasks through the built‑in NGINX Plus API. From NetOps to DevOps, modern app teams need a self‑service, API‑driven platform that integrates easily into CI/CD workflows to accelerate app deployment – whether your app has a hybrid or microservices architecture – and makes app lifecycle management easier.
  • 8
    Microsoft IIS

    Microsoft IIS

    Microsoft

    Internet Information Services (IIS) for Windows® Server is a flexible, secure and manageable Web server for hosting anything on the Web. From media streaming to web applications, IIS's scalable and open architecture is ready to handle the most demanding tasks.
  • 9
    Cloudflare Workers
    You write code. We handle the rest. Deploy serverless code instantly across the globe to give it exceptional performance, reliability, and scale. No more configuring auto-scaling, load balancers, or paying for capacity you don’t use. Traffic is automatically routed and load balanced across thousands of servers. Sleep well as your code scales effortlessly. Every deploy is made to a network of data centers running V8 isolates. Your code is powered by Cloudflare’s network which is milliseconds away from virtually every Internet user. Choose from a template in your language to kickstart building an app, creating a function, or writing an API. We have templates, tutorials, and a CLI to get you up and running in no time. Most serverless platforms experience a cold start every time you deploy or your service increases in popularity. Workers can run your code instantly, without cold starts. The first 100,000 requests each day are free and paid plans start at just $5/10 million requests.
    Starting Price: $5 per 10 million requests
  • 10
    Lucee

    Lucee

    Lucee

    Lucee is the leading open-source CFML application server/engine. Lucee provides a lot of functionality (tags and functions) to deal with all kinds of web related actions. Manipulating images, PDF files, XML, string, numbers, dates and a lot more. You name it, Lucee does it for you! Lucee has built-in support not only to call existing web services, it can also generate web services for you in the most simple way. We are an open source project and welcome contributions in all forms. If you want to dive into code, check out our Contributors guide. You can also get involved by jumping onto our forum to join the conversation. Contribute to the source code repository of the Lucee Association Switzerland, write articles for the newsletter or blog posts, help with documentation, or answer questions on the support forum.
  • 11
    Apache TomEE
    Apache TomEE, pronounced “Tommy”, is an all-Apache Jakarta EE 9.1 certified application server that extends Apache Tomcat that is assembled from a vanilla Apache Tomcat zip file. We start with Apache Tomcat, add our jars, and zip up the rest. The result is Tomcat plus EE features, TomEE. Stable and ready for production, Apache TomEE 8.0 implements Java EE 8/Jakarta EE 8 and supports the javax namespace. Runs on Java 8 or higher. Mostly Jakarta EE 9.1 web profile compliant and supports the new jakarta namespace. Runs on Java 11 or higher. Apache TomEE comes in four different flavors, web profile, MicroProfile, Plus and Plume. Apache TomEE web profile delivers servlets, JSP, JSF, JTA, JPA, CDI, bean validation and EJB Lite. Apache TomEE MicroProfile adds support for MicroProfile. Apache TomEE Plus and Plume add support for JMS, JAX-WS, and more. Mostly Jakarta EE 9.1 Web Profile compliant and supports the new jakarta namespace.
    Starting Price: Free
  • 12
    Apache Geronimo
    Apache Geronimo is an open-source set of projects that are focused on providing JavaEE/JakartaEE libraries and Microprofile implementations. We are actively delivering reusable Java EE components though. They are widely used and still actively maintained! Apache Geronimo provides libraries for the implementations of the Java EE and Jakarta EE specifications. The implementations are also focused on providing OSGi bundle metadata. The goal of XBean project is to create a plugin-based server analogous to Eclipse is a plugin-based IDE. XBean will be able to discover, download and install server plugins from an Internet-based repository. In addition, we include support for multiple IoC systems, support for running with no IoC system, JMX without JMX code, lifecycle and class loader management, and rock-solid Spring integration. Apache Geronimo hosts several Microprofile implementations. Apache Geronimo Arthur is an effort to build a thin layer on top of Oracle GraalVM.
    Starting Price: Free
  • 13
    Payara Enterprise

    Payara Enterprise

    Payara Services Ltd

    Jakarta EE & MicroProfile compatible, supported application servers for production and containerized deployments. Monthly releases, bug fixes, and patches. Rolled into Payara Enterprise products making Payara Server the best option for production Jakarta EE (Java EE) applications and Payara Micro the best option for containerized Jakarta EE applications. Payara Migration & Support engineers assist customers with Payara Server or Payara Micro during development projects before going to production, or provide assistance with the application server migration process. Raise tickets for bugs, incidents or questions related to Payara Server or Payara Micro, including any general questions you may have about configuration, deployment, security, monitoring and troubleshooting. Exclusive access to monthly releases of Payara Server and Payara Micro including crucial fixes and patches. New features are added once they are stable and ready for production use.
  • 14
    Caddy

    Caddy

    Caddy

    Caddy simplifies your infrastructure. It takes care of TLS certificate renewals, OCSP stapling, static file serving, reverse proxying, Kubernetes ingress, and more. Its modular architecture means you can do more with a single, static binary that compiles for any platform. Caddy runs great in containers because it has no dependencies—not even libc. Run Caddy practically anywhere. Caddy obtains and renews TLS certificates for your sites automatically. It even staples OCSP responses. Its novel certificate management features are the most mature and reliable in its class. Written in go, Caddy offers greater memory safety than servers written in C. A hardened TLS stack powered by the go standard library serves a significant portion of all Internet traffic. Caddy is both a flexible, efficient static file server and a powerful, scalable reverse proxy.
  • 15
    Apache Tomcat
    The Apache Tomcat® software is an open source implementation of the Jakarta Servlet, Jakarta Server Pages, Jakarta Expression Language, Jakarta WebSocket, Jakarta Annotations and Jakarta Authentication specifications. These specifications are part of the Jakarta EE platform. Apache Tomcat software powers numerous large-scale, mission-critical web applications across a diverse range of industries and organizations. Some of these users and their stories are listed on the PoweredBy wiki page. The Apache Tomcat Project is proud to announce the release of version 10.0.10 of Apache Tomcat. This release implements specifications that are part of the Jakarta EE 9 platform.
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