Puma

A concurrent web server for Ruby.

Apache Tomcat

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

High-performance web server

CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.

Codeship is a fast and secure hosted Continuous Delivery platform that scales with your needs.

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

A web-based SSH console that executes commands on multiple shells.

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

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

Turning Nginx into a Full-fledged Web App Server

Remember, search, and share your voice conversations

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

RabbitMQ is an open source message broker software.

SAP NetWeaver enables the composition, provisioning, and management of applications across a heterogeneous software environment

Shell In A Box is a web based AJAX terminal emulator that can export arbitrary command line tools…

Swiki is a quite popular implementation of Ward Cunningham’s WikiWikiWeb (Squeak + Wiki = Swiki) that runs under Comanche.

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

Terminal over HTTP and HTTPS.

ZeroMQ is a high-performance asynchronous messaging library.

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