If you like open source development, you’ll love Mac OS X. This fully-conformant UNIX operating system—built on Mach 3.0 and FreeBSD 5—bundles over a hundred of the most popular Open Source products. You can shell out with bash, tcsh, ksh, and zsh; edit your code with emacs, vim, and nano; and build your projects using gcc, make, and autoconf. All these Open Source products are integrated into every Mac, ready to use. You don’t need to worry about finding and downloading compatible versions of different projects. Instead, you can get right to work. Of course, you can also download and build the latest versions of those projects yourself. Those who prefer more than just a command-line, the free Xcode tools included with every copy of Mac OS X will speed up your development time.