This is a simple lightweight way to expose work-in-progress functionality to developers, testers or other internal users.

AcornCache is a Ruby HTTP proxy caching library that is lightweight, configurable and can be easily integrated with any Rack-based web application. AcornCache allows you to improve page load times and lighten the load on your server by allowing you to implement an in-memory cache shared by every ...

Request ID Header

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

Generate a static site from any rackup compatible application.

Detect and show a maintenance page

A message bus for rack

Rodauth is Ruby's most advanced authentication framework, designed to work in all rack applications. It's built using Roda and Sequel, but it can be used as middleware in front of web applications that use other web frameworks and database libraries. Rodauth aims to provide strong security for ...

Parse and serialize geospatial HTTP headers.

Resource-oriented, Rack-based, minimalist web framework.

RESTRack is a Rack-based MVC framework that makes it extremely easy to develop RESTful data services. It is inspired by Rails, and follows a few of its conventions. But it has no routes file, routing relationships are done through supplying custom code blocks to class methods such as "has_relat...

Kiev is a logging tool aimed at distributed environments. It logs to JSON, while providing human-readable output in development mode. It integrates nicely with Rails, Sinatra and other Rack-based frameworks, Sidekiq, Que, HTTParty, Her and other Faraday-based HTTP clients.

Shared configuration for cooperative middleware.

Vagrant on Rails: quickly spin up a Vagrant VM to serve your rack-compatible app.

Compose declarative, component-based responses to HTTP requests

Rack/Rails middleware to log API calls to Moesif API analytics and monitoring

Adds an extra X-REVISION header with source code revision string (git, svn, etc)

Runs a rack conform application inside jetty web server

Hoptoad notifier for rack-based frameworks

Rakwik is a server-side tracker integration for the Piwik opensource web statistics software. It's easy to integrate into rack-based applications and does not require frontend Javascript inclusion.