Rack application monitoring with StatsD: reports key performance metrics for apps served via Rack (throughput, response times, error rates, etc).

A Serverless v1.x plugin to build your deploy Ruby Rack applications using Serverless. Compatible Rack application frameworks include Sinatra, Cuba and Padrino.

This is an OmniAuth provider for Atlassian Crowd's REST API. It allows you to easily integrate your Rack application in with Atlassian Crowd.

Rack middleware to report key app statistics and custom instrumentation to the Librato Metrics service.

A fast HTTP server supporting rack.

`pitchfork` is a preforking HTTP server for Rack applications designed to minimize memory usage by maximizing Copy-on-Write performance.

webmachine is a toolkit for building HTTP applications in a declarative fashion, that avoids the confusion of going through a CGI-style interface like Rack. It is strongly influenced by the original Erlang project of the same name and shares its opinionated nature about HTTP.

thin-rails overrides the Rack::Handler.default method to return Rack::Handler::Thin which will cause rack (and rails) to use thin by default.

puma-rails overrides the Rack::Handler.default method to return Rack::Handler::Puma which will cause rack (and rails) to use puma by default.

Rack compatible HTTP router for Ruby and Hanami

Rack middleware to remove invalid UTF8 characters from web requests.

Obscenity is a profanity filter gem for Ruby/Rubinius, Rails (through ActiveModel), and Rack middleware

UI for viewing logs in Rack

gridfs-rackdav enables you to use GridFS as backend for WebDAV collections with RackDAV application

Rack routing middleware supporting rack apps as actions, and parameterized paths

Rack::Handler using rubylet-rack and Jetty or Tomcat

Rack::OOMKiller is a rack middleware that will check the memory usage of the process post-request, and if > 400mb exit

The Rack::Builder extracted from Rack

The Rack::Builder extracted from Rack

Xapian::Rack provides indexing and searching integration with Rack.