Use your Rack application on AWS Lambda.

A rack middleware to cache requests in static files, a la Rails' page_cache

Validate rack responses against schema named in the Link header

Rack Middleware to inject Segment javascript into your Rack app.

Rack middleware for API Version-specific Component Service redirection.

A rack middleware for exposing session state to tests.

Silence logs per request from Rack

Allows for setting the maximum request time before it get logged also provides a custom log to data relevant to the slow request and can even provide a different log for each slow request for easy debugging.

Rack middlewares to make building and serving a Single Page App from a Ruby Rack app easy.

You can be a Time Traveler.

Mark Tor users using rack, for filtering / throttling / etc

Use Hevents (https://github.com/yarmand/hevents) to create JS init function for Rails controllers and views. Provide helper to setup handlers in your Rails code

A worker pool based on ractor.

Some basics that your application could benefit from.

Misc Faraday middleware and helpers.

Aheui interpreter in Ruby.

An RPC wrapper for RaiBlocks nodes written in Ruby.It connects to an individual node that you control. There's a client object you can use to make explicit RPC calls as well as proxy objects with logically grouped methods.

A declarative, fire and forget way to handle errors in a REST API

Make use of the various open data rails feeds in the UK. Currently only some from Network Rail.

Design patterns for Ruby on Rails