hydra_attribute is an implementation of EAV pattern for ActiveRecord models.

mysql2 plugin supporting aurora failover.

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

Record Cache for Rails 3

Track what product being viewed, what being purchased. Who are consistant buyers etc.

Enable using native sql enums

Jcrop plugin for ActiveAdmin, enable image cropping solution on image fields

Awesome patches backported for ActiveRecord MySQL adapters

N+1 count query killer for ActiveRecord

Add relational OLAP-like functionality for ActiveRecord

integrated library system

https://github.com/tsukasaoishi/fresh_connection

RailsDbInfo is a Rails engine that quickly shows the database info

A Fresh new GraphQL server for Rails applications, with a focus on natural and Ruby-like DSL

A Rails engine that adds a piece of middleware to the top of your middleware stack that looks for redirect rules stored in your database and redirects you accordingly.

TrustyCms is a simple and powerful publishing system designed for small teams. It is built with Rails and is similar to Textpattern or MovableType, but is a general purpose content management system--not merely a blogging engine.

Manage delta indexes via Delayed Job for Thinking Sphinx

This is an ActiveRecord connection adapter for MySQL Spatial Extensions. It is based on the stock MySQL2 adapter, but provides built-in support for spatial columns. It uses the RGeo library to represent spatial data in Ruby.

Yet Another N+1 COUNT Query Killer for ActiveRecord

I am altria.