- bitcointools 13 Python-based tools for the Bitcoin cryptocurrency system
- humane-rails 8 This is a gemified version of Marc Harter's humane-js library.
- bitpay-ruby 7 A library for interacting with the BitPay.com Bitcoin Payment Gateway API.
- gol-in-the-cloud 5 Conway's Game of Life in the Cloud
- nested_form 3 Rails plugin to conveniently handle multiple models in a single form.