NGINX Unit

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

Ampler

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

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

The HTTP/2 Web Server with Automatic HTTPS

Celery is an asynchronous task queue/job queue based on distributed message passing.

Small, fast, modular HTTP server written in Erlang.

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

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

Lightstreamer is a server for delivering real-time messages to browser-based and mobile…

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

A light-weight dynamic CFML scripting language for the JVM that enables the rapid development of simple to highly sophisticated web applications.

OpenBD Java CFML Engine - OpenBD is the worlds first truly open source and free GPL Java CFML runtime.

Turning Nginx into a Full-fledged Web App Server

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

A concurrent web server for Ruby.

Postcards to the President

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

A secure, fast, compliant, and very flexible web-server that has been optimized for high-performance environments