Rack middleware for SassC which process sass/scss files when in development environment.

Rack middleware for API Version-specific Component Service redirection.

Rack Middleware for verifying signed requests

SimpleAuth HMAC authentication

If you're running a javascript single-page-app with html5 routing, you may notice that deep links will 404 unless your web front-end is configured to rewrite all non-asset paths to index.html. If you'd like to achieve t...

Rack::Skippable helps your Rack application to avoid running app logic (app#call) in some conditions.

Making Rack and Rails logs useful

A tiny zero-config Rack App to serve static files

Exposes a metrics collector to the request environment and flushes the data to statsd when the request is finished. Batches the data to send as few packets as possible.

Rack middleware that respond to /status requests and return 200 as status code and "OK" as response body

Rack middleware to taint headers, parameters, and input

Simple HTTP server launcher for Rack application (Sinatra, Rails, etc...)

Rack middleware for resizing proxied requests for images which don't reside on your own servers.

Adding ability to detect timezone at UI side and get it within Rack/Rails via cookies with/o custom handler.

Include and depend on third-party JS (and CSS) libraries

Gemify jQuery for Rack

Rack middleware to automatically include your Typekit JavaScript files

Integrate Unpoly with any Rack or Sinatra application

Urchin Tracking Module for rack application.

rack-varnish-esi is a Varnish ESI middleware implementation for Rack which is as close as possible to Varnish's own ESI implementation. Note: This gem should only be used in development.