LogSpy is a rack middleware sending request log to Amazon SQS

A rack based static site builder with templates, layouts and project structure based routing.

high performance asynchronous rack web server

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

Generate static site from your rack application & test files

Embeds GA tracking code in the bottom of HTML documents

render_static allows you to make your single-page apps (Backbone, Angular, etc) built on Rails SEO-friendly. It works by injecting a small rack middleware that will render pages as plain html, when the requester is one of the most common crawlers/bots out there (Google, Yahoo Baidu and Bing)

This gem provides a Guard that restarts Rack apps when watched files are modified similar. Similar to the wonderful Shotgun by rtomayko

JSender facilitates a simple jsend implementation for ruby with json and rack helpers

Generate strong and weak ETags, evaluate If-None-Match and If-Match headers, and serve 304 Not Modified responses via included Rack middleware.

AMQP-HTTP compliant Server for Rack applications

Rack middleware for visualizing HTTP/JSON requests, and stuff

A super simple, object-focused extendable Rack API.

A http router for Rack and Padrino.

A Rack middleware IP filter that uses Http:BL to exclude suspicious robots.

Rack module that dynamically generates sparkline graphs from a set of numbers.

My simple implementation of Rack web server using pre-fork and event loop

S3Config adopts Heroku-style config management for any Rails application using AWS S3 to store, and Rack middleware to inject environment variables.

An automatic reloading Rack development web server for Ruby.

Decodes the User-Agent header into UTF-8 in any Rack app