Best Application Server Software

Compare the Top Application Server Software as of February 2026

What is 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 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
    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
  • 3
    GigaSpaces

    GigaSpaces

    GigaSpaces

    eRAG (enterprise RAG) combines the power of real-time operational data with GPT’s fantastic user experience: Chat spontaneously and get immediate answers grounded in a unique understanding of your operational data. With its sophisticated semantic reasoning capabilities, eRAG ensures you get accurate, consistent answers. It answers complex, cross-system questions instantly, supports decisions with suggestions, challenges, and next steps. eRAG connects your business data with external events, so that you can weigh the effect of new tax legislation or weather disruptions on your operations. eRAG combines all your operational data sources so you can get a full, unified picture of your business, offering measurable revenue and efficiency outcomes. Through a self-serve UI, IT teams can connect SQL-based databases like Oracle, PostgreSQL, SAP and other systems in just a few clicks. And you can get up and running in 2–3 weeks - no data prep needed.
  • 4
    NGINX Unit
    An universal web app server that combines several layers of the typical application stack into a single component. NGINX Unit simplifies the application stack for web apps and APIs by combining several layers of the typical stack into a single component. NGINX Unit is a universal web app server, intended as a building block for any web architecture regardless of its complexity, from enterprise-scale deployments to your pet's home page. It is equally suited to simplifying modern microservices environments as it is to modernizing legacy and monolithic applications. NGINX Unit was created by the original NGINX team on an all-new, open-source codebase. The architecture incorporates insights from over a decade of running the world’s most popular web server. Unlike the NGINX web server, NGINX Unit uses a multi-process, multi-threaded architecture. The NGINX web server is often deployed as a reverse proxy in front of web applications. NGINX Unit can run the application code natively.
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