Database based asynchronous priority queue system -- Extracted from Shopify
created at Sept. 13, 2008, 2:27 p.m.
Audited (formerly acts_as_audited) is an ORM extension that logs all changes to your Rails models.
created at Feb. 9, 2008, 4:14 p.m.
An awesome replacement for acts_as_nested_set and better_nested_set.
created at Feb. 21, 2008, 4:03 p.m.
Interactor provides a common interface for performing complex user interactions.
created at July 25, 2013, 8:32 p.m.