Yudai Takada

The Ruby Programming Language [mirror]

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

Ruby-inspired shading language that compiles to WGSL and GLSL ES 3.0, with HM-style inference, pattern matching, an LSP server, and a WebGPU playground.

Pure Ruby packet analyzer.

A slim file to minify embedded code.

RuboCop runner for Ruby code embedded in Slim.

Lrama for Visual Studio Code is a powerful extension that provides comprehensive support for the Lrama parser generator.

Monitor Claude Code usage costs from local logs with threshold alerts.

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

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

Building audio-reactive visuals with a Ruby DSL.

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

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

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

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

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

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

Github Action for linting markdown files using mdformat

Custom action to regenerate `.rubocop_todo.yml` and create Pull Request.

A collection of railroad diagrams (syntax diagrams) for various programming languages to serve as a visual reference for developers.

Racc for Visual Studio Code is a powerful extension that provides comprehensive support for the Racc parser generator.

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

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

Generate Mermaid diagrams from Rails models and controllers.

Generate beautiful terminal screenshots from YAML.

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

Ruby bindings for the Skia 2D graphics library.

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

Ruby bindings for WebGPU via wgpu-native.

A RuboCop Extension Template.

A custom cop collection of working toolkits.

Obituary detects archived GitHub repositories for your RubyGem dependencies.

Custom action to autocorrect rubocop offenses.

A RuboCop extension focused on enforcing committee.

A Chrome extension that converts markdown text to Notion-compatible format.

A Chrome extension that copies the page title and URL to your clipboard in `[Title URL]` format.

Ruby bindings for the LLDB debugger.

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.

A Ruby gem to sync Markdown files to Notion pages.

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

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

A Ruby CLI for linting and formatting YAML files

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

Web Bluetooth API-style BLE interface for Ruby.

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

A modern directory jumper with a visual-first TUI, built in Zig.

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.

A minimal LLM implemented in pure Ruby

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

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

💀 A CSS selector parser implemented in Ruby

🌟 Ruby Style Guide, with linter & automatic code fixer

Simple YAML Frontmatter Parser

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

Generate Markdown documentation from OpenAPI specifications.

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

A CircleCI Orb that detects and notifies flaky tests in your project, helping you identify and fix unstable tests quickly.

Interactive Bezier curve drawing tool using Ruby2D.

A terminal slide rule simulator for Ruby, with interactive sandbox, demo, and drill modes.

化学式を解剖し、分子の量を秤り、反応式を釣合はすRubyGemに候

象算木之法，以字畫示整數加減之程

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Fast JSON Schema validator for Ruby.

SimpleIDN ruby gem

Ruby bindings for HarfBuzz text shaping engine

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落語調の帳場言葉で書く、小さな算譜言語「噺椎」の Ruby 処理系。

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数読の祝詞を言割り、文組み、算ひ行ふ処理系。木を示し、椎言語にも写す。

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

以漢文記算法之言語。處理系以丙語第九十九式成之。

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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.

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.

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Lightweight Ruby toolkit for building small music scores, parsing a LilyPond-style syntax subset, and exporting PDF, SVG, or MIDI.

Pure-Ruby MIDI library for messages, ports, SMF I/O, middleware, network MIDI, and MIDI 2.0 UMP.

Linter and formatter for Lrama Style BNF grammar files (.y files).

A small Ruby gem for reading large JSON array, NDJSON, and CSV inputs one record at a time

A linter and formatter for Lrama-style BNF grammar files.

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

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

PicoRuby is the smallest Ruby implementation for one-chip microcontrollers

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the web site for RubyKaja.

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Educational compiler backend targeting C through printf %n, with Brainfuck and conservative LLVM IR subset frontends.

Headless terminal emulator library for Ruby.

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

A LALR(1) parser generator for Perl.

Forecast Terraform provider and module upgrade impacts before merge.

Terraform cost attribution CLI/API for mapping cloud billing costs to Terraform resources, modules, owners, and pull requests.

Govern Terraform scanner waivers, skips, and ignore annotations with policy checks and audit-ready reports.

A LALR(1) parser generator for PHP.

A tiny Ruby JIT compiler for learning how bytecode VMs, interpreters, and x86-64 native code generation work.

Conference sponsorships CRM for Kaigi on Rails

A pure Zig simple RDBMS

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CircleCI orb for managing GitHub pull request comments.

Generation of diagrams like flowcharts or sequence diagrams from text in a similar manner as markdown

Racc is an LALR(1) parser generator. It is written in Ruby itself, and generates ruby programs.

A terminal cockpit for discovering, running, and monitoring project development tasks.

A lightweight TUI command runner for managing multiple development processes from one terminal.

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portfolio site

Lightweight Ruby

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

On a mission to index all Ruby events.

rubykaigi.org router

Static regional.rubykaigi.org

A WebUSB-style API to Ruby applications.

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Ruby FFI bindings for libusb 1.0.

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TUI command runner

👻 Ghostty is a fast, feature-rich, and cross-platform terminal emulator that uses platform-native UI and GPU acceleration.

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

A Ruby FFI binding for PortAudio v19.

Pure Ruby FFI bindings for GLFW 3.3/3.4.

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

Functional, command-oriented OpenGL for Ruby.

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

Source of the https://www.ruby-lang.org website.

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

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

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

A ruby implementation of the RFC 7519 OAuth JSON Web Token (JWT) standard.

RSpec for Sidekiq

A Ruby gem for reading and writing sound files in Wave format (*.wav)

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

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

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

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

🌿 Powerful and seamless HTML-aware ERB parsing and tooling.

Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.

Convert ASCII/Unicode diagrams into clean SVG and PNG images

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

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A Ruby/Rack web server built for parallelism

Advisory locking for ActiveRecord with modern Rails conventions.

JSON Web Encryption for Ruby

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

A Pure Ruby Markdown linter and formatter.

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

SystemRDL parser for Ruby

A modern GitHub TUI client with syntax highlighting and beautiful interface.

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

Bring harmony to your pull requests.

A modern AST-aware diff tool with syntax highlighting and inline editing. Built with Zig for maximum performance.

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Auto corrector for N+1 queries detected at runtime with Bullet

Linear algebra library for 2D/3D graphics in Ruby.

A Ruby C extension providing native macOS window management and Metal GPU acceleration for graphics applications.

Turn Ruby AST into semantically equivalent Ruby source

validate and coerce parameter using OpenAPI3 definition

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A mocking and stubbing library for Ruby

New Relic RPM Ruby Agent

Slim templates generator for Rails

Slim is a template language whose goal is to reduce the syntax to the essential parts without becoming cryptic.

deck is a tool for creating deck using Markdown and Google Slides.

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A Really Ruby Mail Library

An extension of RuboCop focused on thread-safety checks.

北陸Ruby会議01

a converter from Markdown into Re:VIEW, using redcarpet

るびまの編集リソースを集めたり進行状況を確認するリポジトリです

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a Ruby-based regular expression editor

gRPC Ruby Framework

retry randomly failing rspec examples again

Factory Bot ♥ Rails

A library for setting up Ruby objects as test data.

RuboCop's AST extensions and NodePattern functionality

Playwright driver for Capybara

🌱 A new ActionView-compatible ERB engine with modern DX - re-imagined with Herb.

Update Dependabot's pull request for bundler with `--conservative` option.

BiTemporal Data Model for ActiveRecord

Static analysis for GitHub Actions

A small and simple C compiler

🚫 Stop saying "you forgot to …" in code review (in Ruby)

Elasticsearch integrations for ActiveModel/Record and Ruby on Rails

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RSpec helper suite for gruf

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A gem to detect ghost tables in Rails