Rat Hole is a handy library for creating a rack compliant http proxy that allows you to modify the request from the user and the response from the server.

Rack Module to reject unwanted requests.

The super-friendly rack helpers.

Replay the request via Rack env

This gems provide a Rack middleware and a logger formatter for logging with request id in your Rails app.

Build rack responses with functional style

Could be called parts for Rack...

Riak sessions for Rack based application.

Restricted cache in the rack request.

A rack based web framework

Dynamic robots.txt for different Rails environments with Rack.

Java Servlet implementation that forwards to Rack application

Rack Middleware for handling the SnapImage API

Rack middle-ware for supporting SMAAK communication

Rack middleware that duplexes HTTP traffic

Rack router

Spray based Rack Handler for JRuby Apps

Simple Rack middleware for forcing SSL on specific subdomains of an application.

Rack middleware replacing responses with relevant pictures of dogs, based on the status code.

A simple way to provide static files using rack