I’ve written and released some software which may be of interest.

RPN is a decimal reverse polish four-function calculator for Android phones and touchpads. It’s free, but not currently open source. It should be appearing in the Android Market any day now.

RedPill is a screen saver for Mac OS X. It resembles the green code symbols seen in the Matrix series of movies. It uses OpenGL, and is open source.

Syndication is a Ruby package for parsing web feeds in Atom and RSS format. It’s fast, standards compliant, and open source. You should be able to obtain it from RubyGems.