Port of the old, venerable ActsAsTree with a bit of a twist

Money datatype for Mongoid. Inspired by Ruby Money. Makes handling money simple. Stores the value in the db as cents. Currently handles USD.

MonkeySupport monkeypatches some of the performance-sink parts of rails with speedy C extensions.

A ruby library for reading and writing arbitrary messages in DJB's maildir format

Allows Nokogiri objects to be converted to PLists

A tail(1)-like utility for nginx log files. It supports parsing, filtering and formatting individual log lines.

Merge multiple PDFs in to one using iText's PdfCopyFile.

Easy denormalization for your ActiveRecord models

Port of the old, venerable ActsAsTree with a bit of a twist

A plugin/gem that provides access to the Prowl API (http://prowlapp.com). Works with Rails 2 or 3 as well as any other Ruby web frameworks or in your own scripts.

Logs exceptions inside a database table. Now available as gem for Rails3 (previously a plugin for Rails2)

ActiveRecord-like associations for ActiveResource

Components allow you to call other actions for their rendered response while executing another action

Robokassa is payment system, that provides a single simple interface for payment systems popular in Russia. If you have customers in Russia you can use the gem. The first thing about this gem, is that it was oribinally designed for spree commerce. So keep it in mind.

This is a quick'n'dirty gem to parse Quicken QFX format.

RubiGen - Ruby Generator Framework

A simple to use, yet powerful Ruby framework for building console-based applications.

Data mining and machine learning algorithms for JRuby

This is a Ruby API for Fitbit.com, currently scraping, but soon will use the officail API (when released)

Call Lua from Ruby (and Ruby from Lua in Ruby)