Standards-compliant WebSocket server and client

Firehose is a realtime web application toolkit for building realtime Ruby web applications.

Simple pub/sub messaging for the web

Faye Online user list and time count

Rainbows. Twice as good.

Rainbows! helper

Direct-to-socket streaming of Rack response bodies

EventMachineThreadPool model for Rainbows!

rainbows-rails overrides the Rack::Handler.default method to return Rack::Handler::Rainbows which will cause rack (and rails) to use rainbows by default.

Sinatra authentification with saving user data to redis

gem install universe-webserver

UGC management/backup using venti

Zbatery is an HTTP server for Rack applications on systems that either do not support fork(), or have no memory (nor need) to run the master/worker model. It is based on Rainbows! (which is based on Unicorn (which is based on Mongrel)) and inherits parts of each. Zbatery supports your choice of all the thread/fiber/event/actor-based concurrency models and Rack middleware that Rainbows! supports (or will ever support) in a single process.