Observe file, network, and process capabilities used while installing or requiring Ruby gems.

Deterministic syscall fault injection for Ruby programs using Linux seccomp user notifications.

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

Read and write DNS wire messages and RFC 8427 JSON in Ruby, including malformed packets.

Ruby-native lexer generator for parser authors. Write ordinary Ruby specs, run them at runtime, or generate deterministic Ruby for deployment.

Bounded, browser-local profiler for Funicular and PicoRuby development tooling.

Check GraphQL-Ruby resolver contracts against Prism-parsed Ruby source before runtime.

Ruby bindings for HarfBuzz text shaping engine

Pure Ruby LR parser generator with racc-compatible grammars, EBNF extensions, diagnostics, and SLR/LALR/LR(1) backends.

Convert vCard 4.0 and iCalendar to and from jCard and jCal in Ruby.

Read, validate, and convert JSContact 1.0 and 2.0 contact cards in Ruby.

Research-backed safe regression test selection and fast test feedback for Ruby.

Ruby CLI and API for counting public GitHub PRs, commits, issues, and reviews by date range.

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

Hybrid dead-code detection for Ruby projects.

Simple YAML Frontmatter Parser

Decode PicoRuby/R2P2 Cortex-M HardFault logs with matching ELF debug symbols

OTP-style supervision trees for Ruby Ractors with declarative restart strategies and graceful shutdown.

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

Dependency-free Ruby library for loading and writing glTF 2.0 and GLB with GPU-ready packed accessors.

Detect ignored ActiveRecord rollbacks in joined nested transactions

Detect RSpec examples that leak global state, resources, time travel, randomness, or filesystem changes.

A RuboCop Extension Template.

Issue, present, and verify selective disclosure JWTs with key binding in Ruby.

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

Read, validate, and resolve SenML sensor measurements in JSON and CBOR with Ruby.

Evidence-based test suite adequacy analysis for Ruby, combining coverage, mutation testing, checked coverage, redundancy detection, and test-smell heuristics.

RuboCop runner for Ruby code embedded in Slim.

Report and block unintended syscalls in Ruby builds and tests

Ruby desktop packet capture and inspection with protocol details, byte views, and display filters

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

Read, validate, and write RFC 7951 YANG JSON with typed Ruby values and metadata.

Ruby bindings for the Assimp 5.x asset import library

Idiomatic, memory-safe Ruby bindings for Box2D v3

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

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

Share FactoryBot data safely across RSpec examples

Ruby FFI bindings for FreeType 2.11+, with SDF atlases and HarfBuzz text meshes.

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

A Prism-based codemod for safely migrating deprecated graphql-ruby APIs without booting the application.

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

Generated Ruby bindings for Dear ImGui with an idiomatic API, exception-safe DSL, GLFW/SDL3/OpenGL/WebGPU backends, and ImPlot.

Ruby bindings for Jolt Physics, powered by joltc, FFI, and larb

Strict JSON5 1.0.0 parser in Pure Ruby with generated grammar, diagnostics, limits, and lossless Document mode.

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

Generate Mermaid diagrams from Rails models and controllers.

A fast, Prism-native Ruby linter

Ruby bindings for Linux's file-descriptor-based mount API

A modern, dependency-free Ruby client for the Notion API

A practical Perl 5 interpreter written in pure Ruby

Detect PostgreSQL and MySQL session-state leaks in Active Record connection pools.

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

Capture, inspect, and save network packets in pure Ruby.

Ruby JSON processor with a practical jq 1.7.1-compatible subset, CLI, and Ruby API.

RSpec coverage intent metadata, strict coverage checks, and traceability suggestions.

Runtime risky-test detection for RSpec: reports tests with no expectations or unexpected output.

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

Pure Ruby bindings for Linux seccomp user notifications

Japanese seasonal and lunisolar calendar calculations in Ruby: 24 solar terms, 72 microseasons, observances, new moons, and date conversion.

Generate beautiful terminal screenshots from YAML.

Ruby bindings for the Skia 2D graphics library.

Texture-oriented image decoding, conversion, resizing, and GPU upload helpers for Ruby.

Building audio-reactive visuals with a Ruby DSL.

Ruby bindings for WebGPU via wgpu-native.

Fast Prism-native AST traversal, declarative matching, and source rewriting for Ruby

Capture legacy Ruby behavior, synthesize portable specifications, and verify replacement implementations with replay and bounded formal checks.

Ruby FFI bindings for robust Clipper2 polygon clipping, offsets, and GPU-ready triangulation.

Causal profiling toolkit for Ruby that estimates which lines or waits would actually improve throughput or latency.

Ruby bindings for Linux fanotify

OpenTelemetry browser and SSR adapters for Funicular, with OTLP and W3C Trace Context support.

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

A differentiable 3D Gaussian splatting renderer and trainer for Ruby, with Numo::NArray and optional OpenMP acceleration.

書籍『ゼロから作る正規表現エンジン』の章別リファレンス実装

Read, validate, and exchange IODEF incident reports as JSON, CBOR, and XML in Ruby.

Read, validate, and expand JSCalendar events and tasks in Ruby.

Pure Ruby JPEG XL decoder and lossless Modular encoder with no native extensions.

Frame-level Ruby bindings for FFmpeg video and audio encoding/decoding without subprocesses.

A Pure Ruby Markdown linter and formatter.

Pure Ruby library and CLI for reading, composing, editing, and writing OpenUSD USDA and USDZ assets.

A small Mackerel metrics client for PicoRuby that validates service or host metric batches before a single verified HTTPS POST.

Pure Ruby interface to Linux Pressure Stall Information (PSI)

Railroad syntax diagrams in SVG and text, built with Ruby.

Ruby bindings for RenderDoc's in-application API, with programmatic GPU frame capture and RSpec integration.

Catch Active Record objects whose database writes rolled back while their in-memory state stayed changed.

Detect, record, and classify flaky RSpec failures with normalized signatures, isolated reruns, and CI-friendly reports.

A RuboCop extension focused on enforcing committee.

象算木之法，以字畫示整數加減之程

Native CRuby bindings for libseccomp with low-level and Ruby-friendly APIs.

Fast JSON Schema validator for Ruby.

Battery-included monitoring and alerting for Sidekiq

A slim file to minify embedded code.

A three.js-like scene graph and WebGPU renderer for Ruby, with PBR, glTF, animation, shadows, and offscreen rendering.

Catch Active Record transactions napping—detect non-database idle gaps while locks may be held.

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

A custom cop collection of working toolkits.