Let ActiveRecord serialize and cast your UUIDs to and from binary columns in your database.

Loader to solve N+1 issue for good.

Store nested hashes and other types in ActiveRecord hstores

Off The Rails ActiveRecord: Use ActiveRecord with Grape, Sinatra, Rack, or anything else! Formerly known as 'grape-activerecord'.

Adds the validates_uniqueness_without_deleted validator to ignore deleted fields when validating for uniqueness.

pg-eyeballs is a ruby gem that gives you detailed information about how the SQL queries created by the active record code you write are executed by the database. It gives you an easy, ruby friendly way to see the output of the Postgres EXPLAIN command and integrates with the popular query analysis tool gocmdpev

Organize ActiveRecord model into a tree structure using PostgreSQL LTree

pluto-models - planet schema 'n' models for easy (re)use

Easily write arbitrary filters

PunchingBag is a hit counting and simple trending engine for Ruby on Rails

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.

Oauth and OpenID made dead simple

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.

ActiveRecord extension. Allows to save record without calling callbacks and validations.

Enable using native sql enums

It makes working with pure SQL easier with syntax highlighting. Let's you clean your Ruby code from SQL strings.