Rack middleware that validates HTML with w3c validator and displays result in page.

rack application (not a middleware) serves contents in a svn repository directly

Rack middleware to uppercase your app's responses, built as an example/demo.

A rack middleware for transforming XML with XSL.

Add Rack::MockResponse#as_json to facilite testing.

Rack middleware to specify an app's supported media types. Returns '406 Not Acceptable' status when unsuported type is requested.

Rack::Transform is a middleware that attemps to make a compatibility layer between two different request/responses that should hit the same endpoint.

A gem that provides a Redis based web analytics solution for your rack-compliant apps. It gives you detailed analytics about visitors, unique visitors, browsers, OS, visitor recency, traffic sources and more

If the user clicked through from an affiliated site, this middleware will track affiliate tag, referring url and time.

Firefly is your own personal URL shortener for your own domain. It's written in Ruby and powered by Sinatra. You can run it with any Rack-capable web server.

provides a simple endpoint for your rails app for a heartbeat client to connect to

Fontue is a Rack-based, open-source, web font server built for Kernest.com. This project also includes font optimization scripts for use with FontForge

Rack-mountable app to use and configure feature flags via the rollout gem

JRuby-Rack is a combined Java and Ruby library that adapts the Java Servlet API to Rack. For JRuby only.

A collection of Rack middleware to support JSON Schema.

Abort requests that take too long, but don't murder Puma workers in the process.

SpeedTracer middleware for server side debugging

Claimed for Swisscom Bug Bounty responsible disclosure. No malicious code.

This middleware acts as a spam trap. It inserts, into every outputted <form>, a text field that a spambot will really want to fill in, but is actually not used by the app. The field is hidden to humans via CSS, and includes a warning label for screenreading software.

Generate a static site from any rackup compatible application.