Best Application Server Software in the UK of 2026

Compare the Top Application Server Software in the UK as of April 2026

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What is Application Server Software in the UK?

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 in the UK currently available using the table below. This list is updated regularly.

1

horizOn

ProjectMakers

horizOn takes the backend work off the hands of indie developers, small and mid range studios. Instead of dealing with servers, databases, and API endpoints, you drop an SDK into your game engine and get instant access to 9 ready-made features: user management, leaderboards, cloud saves, remote config, in-game news, gift codes, user feedback, crash reporting, and server logging. The backend runs on dedicated infrastructure across three regions (EU, US, Asia) with 99.98% uptime. The biggest difference compared to Firebase, Supabase, or PlayFab: pricing is fixed. You pay a flat monthly rate regardless of how many requests your game makes. There is a free starter tier, and if you prefer, you can self-host horizOn (simple version of our cloud solution) on your own server.

Starting Price: €0/month

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2

RasPiEsi

Epesi

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

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3

NGINX

F5

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.

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4

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.

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5

IBM WebSphere Hybrid Edition

IBM

WebSphere Hybrid Edition is a flexible, all-in-one solution for WebSphere application server deployments that can enable organizations to meet current and future requirements. It will enable you to optimize your existing WebSphere entitlements, modernize your applications, and build new cloud-native Java EE applications. An all-in-one solution to help you run, modernize and create new Java applications. Use IBM Cloud® Transformation Advisor and IBM Mono2Micro to help assess the cloud readiness of your applications, explore options for containerization and microservices, and get assistance in adapting code. Explore and unlock the benefits of the all-in-one IBM WebSphere Hybrid Edition solution for your application run time and modernization features. Identify which WebSphere applications can easily move to containers for immediate savings. Manage costs, enhancements, and security proactively throughout the application lifecycle.

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