kramdown is a fast, pure Ruby Markdown superset converter, using a strict syntax definition and supporting several common extensions.

YARD is a Ruby Documentation tool. The Y stands for "Yay!"

An intelligent — pure Ruby — WHOIS client and parser.

Domain name parser for Ruby based on the Public Suffix List.

A versatile Ruby web spidering library that can spider a site, multiple domains, certain links or infinitely. Spidr is designed to be fast and easy to use.

Fully Featured and Fast hexdumping for Ruby.

Maps external commands and options to Ruby classes

Simple Rake tasks for managing and releasing Ruby projects.

interactive Ruby

Generates command_mapper Ruby classes for a given command

A Cyclic Redundancy Check (CRC) library for Ruby.

Access the query parameters of a URI, just like $_GET in PHP.

Nokogiri (鋸) makes it easy and painless to work with XML and HTML from Ruby.

Mechanize is a ruby library that makes automated web interaction easy.

Simple HTTP and REST client for Ruby, inspired by microframework syntax for specifying actions.

Patch-level verification for Bundler

Searching for unexpected `end` syntax errors takes a lot of time. Let this gem do it for you!

RSpec meta-gem that depends on the other components

A small PEG based parser library. See the Hacking page in the Wiki as well.

Harness the raw power of your machine with JavaScript

A Ruby toolkit for building complete and robust CLI commands.

WebViewRuby is a library that provide bindings for webview/webview a tiny tiny cross-platform webview library to build modern cross-platform GUIs

Headless Chrome Ruby API

mruby/c is another implementation of mruby.

3D Graphics Library for Ruby.

Convert YARD docs to Sorbet RBI and Ruby 3/Steep RBS files

IRB on browser powered by WebAssembly

A flexible framework for maintainable Ruby apps

Access to SIMD instructions in Ruby

Get video info from Dailymotion, Vimeo, Wistia, and YouTube URLs.