I was looking for Cocoa apps which might not have been listed on VersionTracker and found HyperJeff's A Quick Guide to Cocoa Apps, which has every one I've ever seen before plus many more.
In addition, you can break down the complete list into categories via a drop down menu and link to Carbon and Unix listings from additional links at the top of the page.
[Editor's note: The main "hyperjeff" page is already listed here on the links page, but this compilation page definitely deserves a mention!]
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Mac OS X Hints
http://hints.macworld.com/article.php?story=2002042822453633