Browse our comprehensive collection of 45 documented Ruby gems with detailed version histories, statistics, and upgrade guidance.
Ruby gem: pg
Ruby gem: playwright-ruby-client
Ruby gem: poppler
Puma is a concurrent web server for Ruby web applications. Unlike traditional single-threaded Ruby servers, Puma uses a multi-threaded architecture to handle multiple requests simultaneously, improving throughput and resource efficiency. It supports both threaded and clustered modes, making it suitable for development and production environments. Puma is the default web server for Rails applications and works with any Rack-compatible framework.
Pundit is an authorization library for Ruby applications that uses plain Ruby objects to define access policies. It provides a simple, object-oriented approach to authorization where each model has a corresponding policy class containing authorization logic. Unlike role-based systems, Pundit focuses on resource-based authorization, letting you define who can perform which actions on specific objects. The gem integrates cleanly with Rails controllers and views without requiring extensive configuration or DSLs.
Rage is a fast web framework for Ruby that's designed to be Rails-compatible while delivering significantly better performance. It uses non-blocking I/O powered by fibers to handle thousands of concurrent requests efficiently, similar to Node.js architecture. The framework provides familiar Rails-like syntax and patterns, built-in WebSocket support for real-time features, and automatic OpenAPI documentation generation. Rage can be used standalone for building high-performance APIs or integrated into existing Rails applications to improve throughput without major code changes.
Rails is a full-stack web application framework for Ruby that follows the Model-View-Controller (MVC) architectural pattern. It emphasizes convention over configuration, providing sensible defaults and a structured approach to web development. Rails includes components for routing, database abstraction (ActiveRecord), asset management, testing, and more. The framework is designed for building database-backed web applications quickly while maintaining code organization and long-term maintainability.
Ruby gem: rdkafka
Ruby gem: re2
RSpec is a behavior-driven development (BDD) testing framework for Ruby. It provides a domain-specific language for writing expressive tests that read like specifications of how your code should behave. RSpec includes features for test organization, mocking, stubbing, and detailed failure messages. The framework emphasizes readable test syntax and comprehensive testing capabilities, making it a popular choice for Ruby projects that prioritize test-driven development and clear test documentation.
Ruby gem: rsvg2
RuboCop is a static code analyzer and formatter for Ruby. It enforces the Ruby Style Guide and can automatically fix many style violations. RuboCop checks your code for syntax errors, style inconsistencies, and potential bugs, providing detailed reports and suggestions. The tool is highly configurable, allowing teams to customize rules to match their coding standards. Many Ruby projects use RuboCop to maintain code quality and consistency across contributors.