Easily write arbitrary filters

A lightweight cron scheduler for the Que async job worker

Declaratively filter data via URL params, in any Rack app.

The Let's Encrypt certificate manager for rails

Record Cache for Rails 3

Reportable allows for easy report generation from ActiveRecord models by the addition of the reportable method.

Rmre creates ActiveRecord models for legacy database with all constraints found.

Better support for legacy database schemas for ActiveRecord, such as columns named class, or any other name that conflicts with an instance method of ActiveRecord.

Provides an internal extension API to ActiveRecord, in the form of middleware-style callback stacks

A smart sms verification tool

Read from stand-by databases for ActiveRecord

State machine that allows dynamic transitions for business workflows

Sharding

Rails way to harness the power of SQL "EXISTS" statement

ActiveRecord/Rails Integration for the Workflow library. Workflow is a finite-state-machine-inspired API for modeling and interacting with what we tend to refer to as 'workflow'.

Simulate multi-table inheritance for activerecord models using a polymorphic association

ActiveRecord Stand-alone migrations

Awesome patches backported for ActiveRecord MySQL adapters

MySQL index hint support for ActiveRecord

Rescue from MySQL and Sqlite duplicate errors