Not much to explain. Not a lot of code, but wanted it packaged up for easy use/deployment.

Rack middleware to remove cookies at user-defined paths.

Rack middleware to route requests with subdomains to specified routes with substitutions

Rack::TestApp is another testing helper library for Rack application. IMO it is more intuitive than Rack::Test.

Allow web service clients to specify the request time zone in an HTTP header.

Rack middleware for using the Authorization header with token authentication

Rack Middleware for logging raw incoming/outgoing HTTP traffic

Rack Middleware for filtering by user agent

A web console for Rack apps.

A Rack profiler for web applications.

Tagged caching support for Rails

RakeUp provides a set of tasks to automate the management of a local Rack based web application via Rake.

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.

link_to, content_tag, stylesheet_link_tag, javascript_include_tag, etc

Easily runs a rack app for tests that hit web APIs

Reflexive

Renalware uses demographic, clinical, pathology, and nephrology datasets to improve patient care, undertake clinical and administrative audits and share data with external systems.

Connection proxy for ActiveRecord for leader / replica setups.

shared base for request_handler using dry-* gems

RequestHeader gives you per-req global header storage.