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Both projects described below are developed using Cocoa for Mac OS X 10.5.
These are open-source software, licensed under the MIT license (sometimes called the "X11 License"). Although there are no downloadable binaries, source code for both projects can be browsed, downloaded, or both through Google code, which is hosting the projects.
Sleeper is a logging program for ARRL's November Sweepstakes. It accepts a contest exchange entered as a single line of text, and it figures out, with possibly surprising reliability, what the various parts of the line mean.
I used a prior version of Sleeper in the 2007 SSB Sweepstakes. This is a second version, which I didn't have sufficiently done for the 2008 Sweepstakes but hope to finish for this fall.
Chalk is a general-purpose logging program for Mac. It is currently minimally functional: it records basic QSO information, saves and retrieves the QSO database, and imports and exports ADIF data. The ADIF-related functions involve a potentially robust, flexible, and efficient Cocoa library for handling ADIF data.