Encoding Converter, rack middleware used to convert to encoding

Static Assets Middleware is useful.

A warden strategy for easy OAuth2 rack based authentication

Wall is rack middleware that blocks requests

Host rack apps in development using ngnix

Easy performance analytics for your Rack/Rails app!

Verb is Rack middleware that serves RHTML files.

Metrics library for Rack applications using a preforking http server (i.e., Unicorn)

Simple Rack Compatible Web Server in Ruby

A sparkling web framework Rack based

Simple sinatra Rack application that allowes to run sql queries from a web page. Usable for administrative tasks.

A series of components for implementing the Ext.Direct API specification in Rails 2.3 and higher. Ext.Direct in Rails is implementede with Rack Middleware.

Enforces Rails relative URL root at the Rack level, i.e. before requests reach Rails.

Truss Router is a modular Rack Router for Truss

A Rack middleware and Railtie(for Rails3) for API key authentication.

A simple gem to give sitemesh-like functionality in a rack app using decorators.

SimpleJSON is a Rack based JSON frontend server to Amazon's SimpleDB, designed to be used as a simple backend data servers for client side web apps.

sinatra-statsd-helper is a thin wrapper around danielsdeleo/opscode's Statsd Rack middleware

Application server for Rack apps built with Rust

basic helpers and authentication methods for using warden with sinatra also providing some hooks into Rack::Flash