acts_as_versioned is good. This allows an attribute level rollback instead

Auditor allows you to declaratively specify what CRUD operations should be audited and save the audit data to the database.

Track changes on Active Record models based on ActiveSupport::Callbacks and ActiveModel::Dirty

Aura is a CMS.

A rails authentication and authorization engine that reduces clutter in your controllers and views. Includes aliased link_to and button_to helpers that return an empty string if the current user is not permitted to follow the link. Authorization configuration is removed from the controllers and instead is stored in the database and configured through html views.

Use jQuery's autocomplete plugin with Rails 4+.

This is a gem that wraps the AutoSuggest javascript plugin

Extract validations from your database information

Send e-mails in the background by default using the backgrounded gem

Backup is a Ruby Gem written for Unix and Rails environments. It can be used both with and without the Ruby on Rails framework! This gem offers a quick and simple solution to backing up databases such as MySQL/PostgreSQL and Files/Folders. All backups can be transferred to Amazon S3 or any remote server you have access to, using either SCP, SFTP or regular FTP. Backup handles Compression, Archiving, Encryption and Backup Cleaning (Cycling).

Backup is a Ruby Gem written for Unix and Rails environments. It can be used both with and without the Ruby on Rails framework! This gem offers a quick and simple solution to backing up databases such as MySQL/PostgreSQL and Files/Folders. All backups can be transferred to Amazon S3 or any remote server you have access to, using either SCP, SFTP or regular FTP. Backup handles Compression, Archiving, Encryption, Backup Cleaning (Cycling) and supports Email Notifications.

File attachments as attributes for ActiveRecord

Atreides is an engine providing a evented CMS following a KISS principle

A Rails account management engine

Bike is a web application framework that can make feature-rich apps by HTML files only. You need no database setup (by default), no scheme definition, no command-line voodoo. Just put a good old HTML file under skin/, and your new app is already running.

Seeeeeeeee Readme

Easy upload management for ActiveRecord w/Google Storage option

`bounce` will save and return an active record object. This results in a nice refactor of update and create actions in your controllers when used with `respond_with`.

File attachments as attributes for ActiveRecord

Simplifies searching, sorting, and pagination of ActiveRecord models. Includes a model class and a view helper.