Shadow Killer: The screenshot preferences manager that OS X ought to have.
payst: A pastebin / gist clone written in Python to try out Cassandra.
JayPong: A pong clone written in Java.
SQLMerger: My very first open source project and basically my first real program, written in 2010 using C#.
Viviamo.net: Wordpress theme. April 2012. Screenshots: index page.
Inactive / Unfinished
Mucoce: A mini player for iTunes which you can access from your menu bar (for OS X, written in Objective-C).
scarf: An http server library written for and in Objective-C. I only did this to try out writing an http server.
hyperbukkit: An HTTP API for bukkit, written in Python / Jython