A High Performance HTTP Server for Ruby
A high-performance web server for Ruby, supporting HTTP/1, HTTP/2 and TLS.
iodine - HTTP / WebSockets Server for Ruby with Pub/Sub support
A fast and robust web server and application server for Ruby, Python and Node.js
A Ruby/Rack web server built for parallelism
A very fast & simple Ruby web server
TorqueBox Ruby Platform
Unofficial Unicorn Mirror.