This acts_as extension does everything acts_as_list does, but it also works in single table inheritance designs and accepts less brain-damaged scope syntax.

This gem built to allowing records to be lockable. It's lock your records and let'em untouched.

A ruby gem to atomically lock resources to prevent concurrent/multiple lockers from accessing or editing the resource

With ActsAsMentionable you can mention a different models in different contents.

Standard facebook-style messaging system. Not bound to any friendship structure. Integrates directly into your User model. Allows for users to comment on a thread, leave a thread, and be updated when a thread is commented on.

This gem allows to add additional database-stored fields to your models

Make cache methods on ActiveRecord easy!

Simple status management for Active Record models

Rails plugin for change-tracking and moderating visibility and status of your ActiveModels

Store multilingual columns in JSON

Multipart forms using custom routes

It allows to handle JSON and JSONB fields as if they are proper database columns, handling default values, type casting and easier validation.

Rails plugin that enables your models to access OAuth services

Rails gem allowing ActiveRecord models to have order and to move them up and down

Acts as a Parameter Object cf. Refactoring: Ruby Edition

Because most percentages only need to be accurate to two decimals, this gem has you store them as basis points and does the conversion for you.

Manages permalink columns in active record models. Strips special characters and spaces, creates before validation, assures uniqueness. That kind of thing.

Rails gem allowing ActiveRecord models have always one element picked (selected).

Use this gem to create calendar events from Ruby objects. It fully complies with RFC5545 and other associated RFCs.

Description of ActsAsPluggable.