This gem identifies valid tracking numbers and the service they're associated with. It can also tell you a little bit about the package purely from the number—there's quite a bit of info tucked away into those numbers, it turns out.

Ruby/JS GUI framework

High method and class churn has been shown to have increased bug and error rates. This gem helps you know what is changing a lot so you can do additional testing, code review, or refactoring to try to tame the volatile code.

CouchRest Model provides aditional features to the standard CouchRest Document class such as properties, view designs, associations, callbacks, typecasting and validations.

CSV Validator

Tools to build your double entry financial ledger

A simple library to handle recurring events

This library can be used as a module for `fog`.

A configurable and documented Rails view helper for adding gravatars into your Rails application.

Until there is a Kindle API, this will suffice.

Add binary (not string) UUIDs to ActiveRecord in MySQL

Ruby/JS GUI framework

PayPal Express Checkout API Client for recurring billing.

Extend ActiveRecord pluck to return hash instead of an array. Useful when plucking multiple columns.

Simple positioning for Active Record models.

Rambulance provides a simple and safe way to dynamically generate error pages.

Duration type

Make your PG migrations safe.

Gem to extend ActionMailer with SendGrid API support

Define dependency graphs of Sidekiq jobs