Kanban as it should be. Not as it has been.

A lightweight gem that provides IP address restrictions for Rails controllers at the action level.

Automated code reviews via mutation testing - semantic code coverage.

SolidQueue systemd integration for Capistrano

minica is a small, simple CA intended for use in situations where the CA operator also operates each host where a certificate will be used.

A modern profiler for your Rails application

activemodel form object pattern. it embraces multiple AR models and provides a transparent interface as if they were a single model.

Enable a Rails application to have separate databases for each tenant.

tsumiki

Parallel test runner for rspec. Multi-process and multi-node.

Coding Agent Session Manager for Claude Code / Gemini CLI / Codex CLI / Cursor Agent / Copilot CLI / Cline CLI

Convert markdown to keynote

🚥 Traffic control for code.

Synchronize Capybara commands with application JavaScript and AJAX requests

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

Fast tests, clear datasets. Ditch nightmare fixtures and slow confusing factories.

🧪 Durable execution workflows for Active Job

Ruby gems for general-purpose AI agent systems: automation, research, data processing, customer support, content creation. SwarmSDK provides single-process orchestration, persistent memory with sem…

GraphQL Schema Stitching for Ruby

A GitHub CLI extension to easily add co-authors to your latest commit.

Outputs a source level execution trace of a Ruby program.

A fast high-compression read-only file system for Linux, FreeBSD, macOS and Windows

Visualize, explore, and interact with your Rails application's models and associations with ease.

An opinionated front-end starter kit for your "nobuild" application

「sinatraで掲示板を作ろう」の解答例

Tutorial to write a Ruby JIT

A RubyVM written in PHP

Simple.css is a CSS template that allows you to make a good looking website really quickly.