Apple would like you to believe that Mac OS X is a complete package, able to fulfill all your needs out of the box. But unless your needs are limited to e-mail and web browsing, there's plenty of room to improve upon OS X's solid foundations. You could go out and spend hundreds of dollars on software, but in most cases there's no need to fork over your hard earned cash. Here's a list of all the free software you need to trick out your Mac.