Unlike other Ruby Webservers, Puma was built for speed and parallelism. Puma is a small library that provides a very fast and concurrent HTTP 1.1 server for Ruby web applications. It is designed for running Rack apps only. What makes Puma so fast is the careful use of a Ragel extension to provide fast, accurate HTTP 1.1 protocol parsing. This makes the server scream without too many portability issues. If you are using Bundler, just add Puma to your project's Gemfile. Once you've installed...
The emerge toolkit is a state-preserved web development framework. Build your whole application in one easy place. Uses O/R Mapping on the back-end, and Comet-style sockets on the front. http://emergetk.com
commTee is a system which is used to store informations received from mobile clients (Phone, PND, PDA, ...). The system is able to work with about 10k nodes. Used protocols and technologies: UDP, TCP/IP, Sockets, Java, Hibernate, OSGI