Konpeito is a gradually typed ahead-of-time compiler for Ruby with Hindley-Milner type inference and dual LLVM/JVM backends. Compile Ruby to CRuby C extensions (.so) or standalone JARs with seamless Java interop. Includes Castella UI, a reactive GUI framework powered by Skia, based on a port of Castella for Python (github.com/i2y/castella).

Ioc container for ruby 3+

Don't write your code, and rbs types! Write the rbs types first, then generate a template to fill in with business logic.

A Ruby extension implementing the R-tree spatial-index of Guttman-Green.

システムが稼働する上で最初から必要なデータ（マスタデータ）を管理するツールです。

The Model Context Protocol is an open standard that enables developers to build secure, two-way connections between their data sources and AI-powered tools.

SHM Chat app using gRPC and Ricart-Agrawala algorithm

Methodist - a gem for Ruby on Rails created to stop chaos in your business logic. This gem adds generators to your rails application using some patterns: interactor, builder, observer and client. Just use `rails g <pattern> <new_class_name>`. Docs: https://github.com/QNester/methodist/wiki

Method-Ray is a static analysis tool that checks the callability of methods in Ruby code.

SurrealDB client for Ruby (HTTP and WebSocket)

Custom OmniAuth strategy for OpenID Federation providers using openid_connect gem, supporting signed request objects (RFC 9101), ID token encryption/decryption, client assertion (private_key_jwt), and OpenID Federation entity statements. Framework-agnostic and works with Rails, Sinatra, Rack, and other Rack-compatible frameworks.

Read environment variables from 1Password fields (dotenv/json/yaml format) or all fields using the op CLI or 1Password Connect Server API. Export local .env files back to 1Password.

Simplifies getting the right configuration options for a process using pre-loaded configurations from files to manage options for experiments or flights.

Helps convert hashes to immutable objects.

Scalable infrastructure management with Ruby DSL compilation to Terraform JSON. Features template-level state isolation and automation-first design.

A utility gem for normalizing parameters in Rails applications.

A small Ruby library for constructing parsers in the PEG (Parsing Expression Grammar) fashion. Parsanol provides Parslet-compatible API with additional features including static frozen parsers and dynamic parsers, with optional Rust native extension for improved performance.

Parallel tests, coverage (SimpleCov-compatible) formatters, fixtures/snapshots, assets & DB provisioning—zero runtime deps

Predicateable allows you to define predicate methods (like `admin?`) based on a method that returns a Symbol. Similar to Rails enums, with optional strict checking and prefix support.

Decompiling from Ruby to proto file.