Convert ASCII/Unicode diagrams into clean SVG and PNG images

Interactive Bezier curve drawing tool using Ruby2D.

Visualizer for checking B-tree behavior.

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

A Ruby audio synthesis library with a flexible node graph, oscillator and synth variants, effects, transport/event scheduling, sample playback, analysis utilities, offline rendering, and an optional PortAudio-backed realtime context.

Pure Ruby fast lexer generator.

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

🟦 Bluish color scheme for irb

Generate Mermaid diagrams from Rails models and controllers.

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

A Pure Ruby Markdown linter and formatter.

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

Bring harmony to your pull requests.

Simple YAML Frontmatter Parser

A Ruby FFI binding for PortAudio v19.

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

Pure Ruby packet analyzer.

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

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

A RuboCop Extension Template.

Functional, command-oriented OpenGL for Ruby.

A sandbox where you can casually try out capybara.

Generate beautiful terminal screenshots from YAML.

RuboCop runner for Ruby code embedded in Slim.

A Ruby gem to sync Markdown files to Notion pages.

A minimal LLM implemented in pure Ruby

A WebUSB-style API to Ruby applications.

A pure Ruby audio processing gem focused on ergonomic APIs and immutable audio transforms.

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

A Ruby CLI for linting and formatting YAML files

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

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.

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

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

A Ruby live coding toolkit for composing musical patterns with rational time and OSC/MIDI output.

Parses Terraform (.tf) files and generates infrastructure design documentation in Markdown format.

A cli that highlights gems you can likely remove from a Ruby project's Gemfile.

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

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

Ruby FFI bindings for the core JACK Audio Connection Kit client APIs.

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

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

A tool to create mermaid class diagrams from Ruby code.

Ruby FFI bindings for RtMidi with Ruby-idiomatic MIDI input/output, typed messages, and low-level C API access.

Obituary detects archived GitHub repositories for your RubyGem dependencies.

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

Convert PlantUML to Mermaid

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

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

Ruby wrapper for Linux `ptrace(2)` focused on building tracers and debugger-like tooling with a Ruby-friendly API.

Headless terminal emulator library for Ruby.

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

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

Sandbox

Ruby bindings for the Skia 2D graphics library.

Ruby audio feature extraction library with WAV analysis and optional FFTW acceleration.

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

Generate Markdown documentation from OpenAPI specifications.

Building audio-reactive visuals with a Ruby DSL.

Ruby bindings for WebGPU via wgpu-native.

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

Web Bluetooth API-style BLE interface for Ruby.

A Ruby toolkit for building small scores with a Ruby DSL and exporting them to PDF, SVG, or MIDI.

Ruby FFI bindings for FFTW3 (Fastest Fourier Transform in the West).

Pure Ruby FFI bindings for GLFW 3.3/3.4.

Ruby bindings for HarfBuzz text shaping engine

Advisory locking for ActiveRecord with modern Rails conventions.

Ruby bindings for the LLDB debugger.

lxdb (LLeXtreme DeBugger) is a powerful, pwndbg-style debugger for Ruby built on top of lldb-ruby.

A pure Ruby library for building, reading, and writing Standard MIDI Files (SMF)

A Ruby audio feature extraction library that provides a full pipeline from audio loading to spectral analysis, feature extraction, rhythm analysis, effects, and lightweight visualization.

Ruby FFI bindings for libogg, the OGG container format library.

A small 2D game engine for PicoRuby and CRuby-based POSIX development.

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

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

A RuboCop extension focused on enforcing committee.

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

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

A pure Ruby LALR(1) parser generator. You define a grammar with a Ruby DSL, and Rusa generates a standalone Ruby parser with no runtime gem dependency.

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

A slim file to minify embedded code.

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

Ruby FFI bindings for libusb 1.0.

Ruby FFI bindings for libvorbis and libvorbisenc. Provides Vorbis audio codec encoding functionality.

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

A custom cop collection of working toolkits.