JBoss

JBoss is Red Hats Java EE 5-compliant (soon Java EE 6-compliant) application server.

19 Alternatives To JBoss

Ampler

Smart, light and fast e-bike that looks like a regular bike

Apache Tomcat

An open source software implementation of the Java Servlet and JavaServer Pages technologies

Cowboy

Small, fast, modular HTTP server written in Erlang.
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Eclipse Jetty

Jetty is a highly scalable modular servlet engine and http server that natively supports many modern protocols like SPDY and WebSockets.

JOnAS

JOnAS is a leading edge Java EE 5 certified Open Source OSGi Enterprise Server by OW2.
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LiteSpeed Web Server

LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.

NGINX Unit

A dynamic web and application server with Go, PHP, Python, Perl, and Ruby support.

OpenResty

Turning Nginx into a Full-fledged Web App Server
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Oracle WebLogic Suite

Oracle WebLogic Suite is an application server for building and deploying enterprise Java EE applications.
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Payara Server

Payara Server is fully supported, developer-friendly, open source application server. Innovative, cloud-native, optimized for production deployments.

Phusion Passenger

Phusion Passenger is a multi-language (Ruby, Python, Node) web & app server which can integrate into Apache and Nginx
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PostgreSQL

PostgreSQL is a powerful, open source object-relational database system.
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Pusher

Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality via WebSockets to web and mobile apps.
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Spring

The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications
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Unicorn

Unicorn is an HTTP server for Rack applications designed to only serve fast clients on low-latency, high-bandwidth connections.

WebSphere Application Server

Learn how you can use application servers from IBM to quickly create, connect and optimize applications on premises and on the cloud.
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simperium

Move data everywhere it’s needed, instantly and automatically