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

RPN is a decimal reverse polish four-function calculator for Android phones. It’s free and open source, and has an Android 4 (Holo) UI.

RedPill was a screen saver for Mac OS X. It resembled the green code symbols seen in the Matrix series of movies. It no longer works under new versions of OS X.

SnowSaver 2.0 was a complete rewrite of my popular screensaver which showed 3D snowflakes. Version 2 generated snowflakes algorithmically from polygons, so that no two were identical. Apple rejected it, so it is unlikely to be released; see the RedPill page for more info.

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