Introspects your database string field maximum lengths and automatically defines length validations.

This gem enables your model to query the database using the earthdistance extension. This should be much faster than using trigonometry functions over standart indexs.

Simple tagging gem for Rails using postgres array.

Auto-create models, views, controllers, and routes with this slick Rails extension

CMS built on rails with love.

Give your models as-of date temporal extensions. Built entirely for PostgreSQL >= 9.4

Tracking exceptions for Rails application store them in database by exception_notification gem.

Store nested hashes and other types in ActiveRecord hstores

A graphical user interface for your PGBouncers

Use LDAP permissions in PostgreSQL

A lightweight cron scheduler for the Que async job worker

This gem makes Rails console sessions less dangerous in specified environments by warning, color-coding, auto-sandboxing, and allowing read-only external connections (disables job queueing, non-GET requests, etc.)

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

Recursively traverse trees using a single SQL query

With Amountable, you can easily attach, organize and sum Ruby money fields to your models without migrating.

Another business actions architecture for Rails apps

Ruby gem that automatically adds a lock timeout to all Active Record migrations

Adds recurring jobs for Sidekiq

postgresql hstore parser/deparser - provides PgHstore.dump and PgHstore.load (aka parse)

RailsDbInfo is a Rails engine that quickly shows the database info