This is a list of the more mature Open Source projects in which I have/had a major involvement. Several other projects are on Github.
OCMock is an Objective-C implementation of mock objects. Thanks to the powerful Objectice-C runtime only 200 lines of code in two classes were required to implement a fairly complete mock object library. A few years and a few more features later we're at several thousand lines, though.
CCMenu displays the build status of projects on a continuous integration server as an item in the Mac's menu bar. Or in other words, CCMenu is to OS X what CCTray is to Windows. And in case you are wondering: of course it is prettier.
This is a small screensaver I wrote in 2001 after reading MAEDA@MEDIA. At the time my PowerBook Pismo was a bit too slow to render this at acceptable framerates but now it looks as lovely as it was intended. The actual animation depends on the mouse position. So, be surprised by new patterns each time, or move the mouse while the screen saver is active.
Neo is a framework for .NET developers who want to write enterprise applications with an object-based domain model. It is well suited for domain-driven design and agile development. Neo includes tools that create an extensible object-based domain model as well as the database schema from a an abstract description of the model. At runtime, rich schema information is used to dynamically generate all SQL required for object persistence management.
A collection of frameworks for Mac OS X, GNUstep and WebObjects. The Common framework provides advanced datastructures, socket wrapper classes, a lightweight XML DOM implementation and other goodies. The Message framework covers internet messages (in the sense of email and usenet postings) and the Style Sheet framework is a templating engine.
A little application to display logfiles on your Mac desktop. The main reason for writing and publishing MkConsole was my continued frustration with the Mac OS shareware mentality. How can people work on an operating system that got so much from the Open Source community and then make a piece of software that can be written in a weekend shareware? How can we expect to see lots of great software on the Mac when a lot of promising software is closed source and cannot be improved by the community?
I came across WordNet while writing my thesis and since there was no client for the platform I was using at the time I wrote one. In the following year Marcus did a great job porting it all the way to Mac OS X.
In 1995 Constantin asked me whether I wanted to join him in his effort to write a good newreader for the NeXTSTEP platform; something that was desperately needed at the time. A while later we released version 0.8 which became a huge success and was at times the most popular newsreader for NeXTSTEP.