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

Rack::Hanoi helps you to solve Hanoi's Tower question using your browser. It can be used as a Rack middleware.

Rack::Profile lets you easily profile your Rack application

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

Luban::Rack is a Luban deployment application to manage Rack based web application deployment and control

BookingSync-Rack-P3p is rack middleware for inserting P3P headers into apps. This will allow your application to serve cookies to IE when in an iframe. It will also pull off the cookie on 304 responses, since IE does not like the cookie then.

Rack::Cache uses PATH_INFO to calculate the cache-url. Lighttpd sets this wrong. This Rack middleware fixes that

crashdesk-rack is the Rack gem for integration with crashde.sk servers

regurgitator is a GPL-licensed library and Rack middleware for serving files stored in MogileFS. It can be embedded inside any existing Rack application or be used as a standalone Rack app.

Rack Middleware to inject Google Tag Manager code snippet into server html responses for rack based applications

The Rack::Builder extracted from Rack

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

dommy-rack lets a Rack application (including Rails) be visited and manipulated as a Dommy::Document without launching a real browser. It provides a small, synchronous, browser-like session API with navigation, cookies, redirects, link clicking, and form submission.

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

Makes middleware that ships with Rack bullet-proof for async responses.

Serves an ElasticGraph application using Rack.

Server-side Ruby implementation of the x402 protocol providing Rack middleware to require payments and a facilitator client for verify/settle flows. Supports the 'exact' scheme across EVM and Solana networks.

Rack compatible HTTP router for Ruby

OKF (Open Knowledge Format) is portable knowledge: Markdown files with YAML frontmatter that both humans and agents read from one source. This gem is the Ruby-native way to work with it. Its companion agent skill authors and curates a bundle. The `okf` command-line tool validates the result for ...

Racker allows for hierarchical template definitions for Packer.