Remy Sharp's jQuery plugin adds a bindable 'inview' event for detecting when an element is scrolled into view.
REST interface for MongoDB written in Ruby
Ruby interface for controlling the Lego Mindstorms NXT robotics kit via Bluetooth.
Rails plugin providing a Ruby API for interacting with a Confluence wiki system.
Adds finite state machine behaviour to Ruby classes. Meant as an alternative to acts_as_state_machine/AASM.
Picnic makes it easy(ier) to distribute and run Camping-based applications as well-behaved stand-alone Linux servers (but works on Windows too!)