xcode

If you have ever been interested in writing your own applications for Mac OS X, read Justin Williams' getting started guide for new developers. He will outline a brief history of Mac development, lay out what options you have, and then set you on the right path to developer enlightenment.

This technote describes a number of 'secret' debugging facilities in Mac OS X, including environment variables, preferences, routines callable from GDB, special files, and so on. If you're developing for Mac OS X, you should look through this list to see if you're missing out on something that will make your life easier.