“Yeah! Free tools!”
For those of you coming from the Mac, you might remember MPW (Macintosh Programmers Workshop). This worksheet-style development environment allowed you extremely extensive control over your build configuration. I still remember working on a project that had Assembly, Pascal, and C modules and an incredibly long script that would take hours to build it all on the fastest 68020 of the day. If you ever needed a break, you could “accidentally” touch a well-used header file.
Apple's tools today are much more advanced than MPW, and best of all they're free with Mac OS X. Apple ships a plethora of tools for development, debugging, and exploration. You will mainly use Project Builder ...