Command-line option parser for Ruby

https://www.manageiq.org/optimist/ https://github.com/ManageIQ/optimist

Org mode parser written in Ruby

https://github.com/wallyqs/org-ruby

Provides a single point of entry for using basic features of ruby ORMs

https://github.com/ianwhite/orm_adapter

Allows for some useful and easy functions

https://github.com/rdp/os

Network packet manipulation library

https://github.com/lemontree55/packetgen

Run any kind of code in parallel processes

https://github.com/grosser/parallel

Soft deletion mapper for activerecord

https://github.com/rubysherpas/paranoia

Parse cron expressions and calculates the next occurence

https://github.com/siebertm/parse-cron

Ruby parser written in pure Ruby

https://github.com/whitequark/parser

Parser construction library with great error reporting in Ruby

https://kschiess.github.io/parslet/

Terminal strings styling with intuitive and clean API

https://github.com/piotrmurach/pastel

Ruby HTTP client library based on libcurl

https://toland.github.io/patron/ https://github.com/toland/patron

Fast PostreSQL array parsing

https://github.com/dockyard/pg_array_parser

Performance dashboard for Postgres

https://github.com/ankane/pghero

Performance dashboard for Postgres

https://github.com/ankane/pghero

All-purpose Property List manipulation library

https://github.com/patsplat/plist

Almost-pure-ruby PNG library

https://www.zenspider.com/projects/png.html https://github.com/seattlerb/png

Provides a registry of file types

https://github.com/cjheath/polyglot

PostgreSQL data types extension for ActiveRecord

https://github.com/dockyard/postgres_ext

SVG renderer for Prawn PDF library

https://github.com/mogest/prawn-svg

Prism Ruby parser

https://ruby.github.io/prism/ https://github.com/ruby/prism

Check address for private network (RFC 1918)

https://github.com/jtdowney/private_address_check

Compresssor and decompressor for HTTP 2.0 HPACK

https://socketry.github.io/protocol-hpack/ https://github.com/socketry/protocol-hpack

Provides abstractions to handle HTTP protocols

https://socketry.github.io/protocol-http/ https://github.com/socketry/protocol-http

Provide abstractions for working with URLs

https://socketry.github.io/protocol-url/ https://github.com/socketry/protocol-url

Add HTTP or SOCKS proxies support and force TCPSocket to use proxies

https://github.com/samuelkadolph/ruby-proxifier

Add HTTP or SOCKS proxies support and force TCPSocket to use proxies

https://github.com/chef/ruby-proxifier

YAML parser and emitter

https://github.com/ruby/psych

Ruby domain name parser based on the Public Suffix List

https://github.com/weppos/publicsuffix-ruby

Simple Authentication and Security Layer

https://github.com/pyu10055/ruby-sasl

Qiniu Resource (Cloud) Storage SDK for Ruby

https://github.com/qiniu/ruby-sdk

Dumb PEG parser library

https://github.com/floraison/raabro

Rack, a modular Ruby web server interface

https://github.com/rack/rack

HTTP Accept* for Ruby/Rack

https://github.com/mjackson/rack-accept

Rack middleware for throttling and blocking abusive requests

https://github.com/kickstarter/rack-attack

Rack middleware to enable HTTP caching

https://github.com/rack/rack-cache

Contributed Rack Middleware and Utilities

https://github.com/rack/rack-contrib

Middleware that will make Rack-based apps CORS compatible

https://github.com/cyu/rack-cors

Rack, a modular Ruby web server interface

https://github.com/rack/rack

Stackable dynamic tree based Rack router

https://github.com/josh/rack-mount

OAuth 2.0 Server & Client Library

https://github.com/nov/rack-oauth2

OAuth 2.0 Server & Client Library

https://github.com/nov/rack-oauth2

Provides a more HTTPish API around the ruby-openid library

https://github.com/josh/rack-openid

Collection of Rack middleware to protect against opportunistic attack

https://sinatrarb.com/protection/ https://github.com/sinatra/sinatra/tree/main/rack-protection

Collection of Rack middleware to protect against opportunistic attack

https://sinatrarb.com/protection/ https://github.com/sinatra/sinatra/tree/main/rack-protection

Collection of Rack middleware to protect against opportunistic attack

https://github.com/sinatra/rack-protection/tree/stable-1.5

Collection of Rack middleware to protect against opportunistic attack

https://github.com/sinatra/sinatra/tree/master/rack-protection

Collection of Rack middleware to protect against opportunistic attack

https://sinatrarb.com/protection/ https://github.com/sinatra/sinatra/tree/main/rack-protection

Request/response rewriting proxy capabilities with streaming

https://github.com/ncr/rack-proxy

Session implementation for Rack

https://github.com/rack/rack-session