Pubsubstub can be added to a rack Application or deployed standalone. It uses Redis to do the Pub/Sub

Upload files to Rackspace Cloud or Amazon S3 by URL or file with automatic image resizing.

resque-alive adds a Kubernetes Liveness probe to a Resque instance. How? resque-alive provides a small rack application which exposes HTTP endpoint to return the "Aliveness" of the Resque instance. Aliveness is determined by the presence of an auto-expiring key. resque-alive schedules a "heart...

The aim of this gem is to ban a list of countries using a rack middleware

Rack middleware for your RestPack web apps

Rack middleware that writes the serial number of issued certs to a Redis database. Uses r509 and r509-ca-http

web application to publish static files based on git and rack

Zephyre is a web development framework built on Rack. Use Zephyre to build quick websites with ruby.

Native Intelligence runtime for Ruby Rack applications

Layouts in rack

A rack middleware and a handful of rake tasks to sync your translations between webtranslateit.com and gettext_i18n_rails application

Sinatra札幌の2013年～2014年の活動を振り返ると、いろいろなものとSinatraを組み合わせたものがほとんどでした。そこで、Ruby/GTK2（GTK+）、Gosu（SDL）、Sinatra（Rack）を例として、GUIアプリケーション、ゲーム、Webアプリケーションを対比させてみたいと思います。

webserver using rack

Drop-in Rack middleware that injects a toggle button to render the current page as a hand-drawn-looking lo-fi wireframe. Useful for design reviews, screenshots, and concept critique.

Rack middleware for connecting to WhenAUser

Whisky is a micro-framework built upon Rack.

A rack middleware health check

Rack request shield

Static Assets Middleware is useful.

Drop-in OpenTelemetry instrumentation for Rails, Sinatra, and Rack apps. Sends traces, metrics, and logs to the Tracelit ingest API via OTLP/HTTP.