This gem doesn't really implement a state machine. All it really does is provide an easy way to transition a model from one status to another using standard form submit buttons, while also saving other changes made to that model.

Keeps track of all your models attributes in a polymorphically associated table

A simple auto-transitioning state machine

All the extras that Sinatra prefers while performing

Basic authentication gem with support for Datamapper and ActiveRecord.

Sinatra video manager

Adds `since` and `until` scopes to ActiveRecord::Base

Globalize3 successor which use only one table to store all the translations.

Another replacement for factories and fixtures

Fixtures replacement with scenarios

Open-source Dropbox using Ruby and Git (my fork with github favoured markdown support).

Migration helper extensions for Ruby On Rails development

ActiveRecord/Rails Sphinx library

A simple and complete ACL system for Rails, that allows to specify a role for an user for a single resource.

Control which columns are loaded when preloading associations; prevents N+1 queries while reducing memory usage.

Fast webserver log parser for persisting daily pageviews per path to sqlite

High performance ActiveJob Queue Adapter for PostgreSQL that provides maximum reliability and ACID compliance

Datamining Bot

A command-line tool to search Skype history.

Search and retrieve Skype conversations from the cli