RailsAdmin is a Rails engine that provides an easy-to-use interface for managing your data

Sequel: The Database Toolkit for Ruby

A self-hosted, anti-social RSS reader.

Profiler for your development and production Ruby rack apps.

[DISCONTINUED ] Attributes on Steroids for Plain Old Ruby Objects

Mutation testing for Ruby. AI writes your code. AI writes your tests. But who tests the tests?

Contracts for Ruby.

Compose your business logic into commands that sanitize and validate input.

A toolkit for building Null Object classes in Ruby

Time registration that doesn't suck

Simplifies querying of structured data using relational algebra

Wrong provides a general assert method that takes a predicate block. Assertion failure messages are rich in detail.

This is an old ROM prototype that's no longer developed.

Delegate methods in Ruby and preserve self. Add behaviors to your objects without altering their superclass hierarchy.

Fake library for Ruby

Model and repository framework

Compose, decouple and manage domain logic and data persistence separately. Works particularly great for composing form objects!

An alternative to accepts_nested_attributes_for that doesn't tightly couple your view to your model

Rack middleware that provides access to rack.session environment

A data migration and visualization command line gem in Ruby

Lightweight web application stack with pluggable routing front-ends

Define equality, equivalency and hash methods automatically

This toy application is an experiment with the idea of use case driven architecture and isolation from frameworks.

Powerful, flexible and configurable coercion library. And nothing more.

Monospace Unicode and Emoji character width in Ruby

Gaming and MMO focused calendar application as an experiment on Rails application development.

A feature-rich, easy-to-use plain text table formatter.

A minimalistic way of separating your models from ActiveRecord

Validate associated models, and aggregate their errors onto the primary model