Calculate the Pascal triangle.

Pure Ruby packet analyzer.

A tool to create mermaid class diagrams from Ruby code.

A Ruby gem for converting SVG files to PNG images. Can be used as both a CLI tool and a Ruby library.

A multiplayer Tetris game written in Ruby that runs over Telnet. Play classic Tetris against another player in real-time through your terminal.

A custom cop collection of working toolkits.

A programming language compiler using "Grongi language," the language of the Gurongi tribe from Kamen Rider Kuuga (Masked Rider Kuuga).

Language Server Protocol (LSP) implementation for Lrama Style BNF grammar files (.y files).

A tiny Ruby library for generating finite state machine (automaton) diagrams as SVG.

Generate Mermaid diagrams from Rails models and controllers.

Ruby bindings for the LLDB debugger.

Bring harmony to your pull requests.

A slim file to minify embedded code.

A Pure Ruby Markdown linter and formatter.

A RuboCop extension focused on enforcing Sidekiq best practices and coding conventions.

Convert ASCII/Unicode diagrams into clean SVG and PNG images

WebRTC bindings for Ruby, providing real-time audio, video, and data channel capabilities.

Bevy bindings for Ruby, providing ECS-driven game/app architecture, 2D rendering sync, input bridging, and runtime interaction events.

Replay test suite's HTTP interactions as WebMock stubs in RSpec.

Convert log of radeontop to CSV style.

Search for Cops that can be automatically modified among the Cops listed in .rubocop_todo.yml.

Pure Ruby fast lexer generator.

Visualizer for checking B-tree behavior.

🎮 A game in which you enter the name of the class and compete for the number of letters on rurima's page.

Sample code for RubyConf Taiwan x COSCUP 2025 "Joy with 3D Graphics Using Ruby"

RuboCop runner for Ruby code embedded in Slim.

A RuboCop Extension Template.

A Ruby gem to sync Markdown files to Notion pages.

🛤️ A tiny Ruby+SVG library for drawing railroad syntax diagrams like JSON.org.

A pure Ruby library for visualizing automata and state machines. Supports multiple output formats including Mermaid, GraphViz DOT, PlantUML, and interactive HTML.

WebXR Device API bindings for Ruby. Build VR/AR applications in Ruby using ruby.wasm.

RuBy Graphics Library - A pure Ruby graphics library with software rendering engine and cross-platform GUI support.

Generate beautiful terminal screenshots from YAML.

Regression testing for Ruby APIs, files, and data snapshots. Compare outputs across environments with tolerances and ignore rules.

A Ruby CLI for linting and formatting YAML files

Simple YAML Frontmatter Parser

Advisory locking for ActiveRecord with modern Rails conventions.

Obituary detects archived GitHub repositories for your RubyGem dependencies.

Ruby FFI bindings for SDL3 (Simple DirectMedia Layer 3).

Ruby bindings for WebGPU via wgpu-native.

List release note diffs.

A simple Gemfile parser.

Sandbox

🟦 Bluish color scheme for irb

A sandbox where you can casually try out capybara.

Lens of Truth to check if the automatic modification by RuboCop is not causing changes in the AST.

Convert PlantUML to Mermaid

Interactive Bezier curve drawing tool using Ruby2D.

Convert Mermaid diagrams to SVG files using Puppeteer. Supports both CLI and programmatic usage with batch conversion capabilities.

A RuboCop extension focused on enforcing RSpec. A place where no one is officially employed, but where useful cops can gather.

A hobby regex engine written in Ruby. Designed to be simple and efficient for educational purposes.

Generate Markdown documentation from OpenAPI specifications.

A linter and formatter for Lrama Style BNF grammar files (.y files). Collie helps you write clean, maintainable, and error-free grammar files for parser generators like Lrama, Yacc, and Bison.

A Ruby gem for visualizing the cascade deletion impact in Rails applications. BlastRadius helps you understand which records will be deleted when you delete a record, based on ActiveRecord associations with dependent options.

Rdeck is a Ruby CLI tool that converts Markdown presentations to Google Slides, enabling continuous deck creation with content and design separation.

A visual editor for Lrama grammar files (.y files) powered by Ruby Wasm.

Ruby Like Shading Language - A Ruby DSL for writing shaders that transpile to multiple GPU shader languages.

Auto-fix N+1 queries detected by Bullet at runtime.

A RuboCop extension focused on enforcing committee.

Parselly is a module providing a simple way to parse and extract data from a css selector 🌿

A modern static site generator for Ruby with Vite/Tailwind integration.

rspec-rewind is a modern retry orchestration gem for RSpec.

Licensure is a RubyGem CLI tool that inspects dependency licenses from `Gemfile.lock` and checks them against a configurable allow list.

Ruby bindings for the Skia 2D graphics library.