Track changes to your models, for auditing or versioning. See how a model looked at any stage in its lifecycle, revert it to any version, or restore it after it has been destroyed.

Reconnaissance tool for GitHub organizations

For use with client side single page apps such as the venerable https://github.com/lynndylanhurley/ng-token-auth.

Strategies for cleaning databases using ActiveRecord. Can be used to ensure a clean state for testing.

Log all changes to your models

Log all changes to your models

Attach comments to your ActiveRecord queries.

Adds methods to ActiveRecord::Migration to create and manage database views in Rails

Seed Fu is an attempt to once and for all solve the problem of inserting and maintaining seed data in a database. It uses a variety of techniques gathered from various places around the web and combines them to create what is hopefully the most robust seed data system around.

mail_room will proxy email (gmail) from IMAP to a delivery method

This gem allows you to use sharded databases with ActiveRecord. This also provides a interface for replication and for running migrations with multiples shards.

Apartment allows Rack applications to deal with database multitenancy through ActiveRecord

BOSH Director

counter_culture provides turbo-charged counter caches that are kept up-to-date not just on create and destroy, that support multiple levels of indirection through relationships, allow dynamic column names and that avoid deadlocks by updating in the after_commit callback.

Sync Postgres data between databases

The push notification service for Ruby.

Database-backed Active Job backend.

Common libraries for RedmineUP plugins (www.redmineup.com) for Redmine. Requered Redmine from http://redmine.org

CMS

Adds core features so other engines can hook into the framework.