acts_as_versioned is good. This allows an attribute level rollback instead

Log changes to your models

Uses created_by_user_id and updated_by_user_id to store the changes made to a record. This is limited to storing the user who created the record and the last user to update the record.

Ruby client for Aurfy

Ruby DSL based software provisioning tool

AusPhones validates and identifies Australian phone numbers by region and type (mobile, land-line etc)

Best-practices tooling for CloudFormation and AWS.

Implements Auth0's setup for authentication/authorization along with setting a current_user method.

Auth Client

An unobtrusive ruby authentication library based on ActiveRecord.

Rails authentication done right

Personal additions for Oauth and OpenID made dead simple

Oauth and OpenID made dead simple

Flexible authentication solution for Rails

AuthoRails is a framework for generating authorizations,tables,relations,scaffolds and privileges.

A gem for rails giving vast flexibility in authorization management.

CanCan supported transaction on top of ActiveRecord

Authorization that includes basic authorization and 3 social authorization with Latvia social network draugiem.lv, facebook.com and twitter.com.

A JSON based Authorization.

Rule-based programmable permission system.