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
    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
  • 2
    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.
  • 3
    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.
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