"If you want to make use of open source software on a Macintosh running OS X, you have plenty of options. The Fink project modifies Unix/Linux open source packages to run on Mac OS X, and gives users the ability to build from source or download precompiled binaries. Many open source packages have native OS X versions -- Firefox, Thunderbird, Abiword, Nvu, and the GIMP among them. But if you dig deeper, you will find quite a few Mac-only open source software gems. Here are a few of the best open source programs written specifically for Mac OS X."