Mactracker is a free program that provides users with a virtual encyclopedia of information on nearly every Apple product produced since the original Mac Lisa. This handy, free utility can be useful (and fun!) in a number of circumstances, and we consider it a very handy tool for almost any Mac geek, particularly if you are frequently interested in finding specs for certain models of Apple equipment. As an example, you can use Mactracker to find out the RAM requirements of nearly any Mac ever made. Or, you can use it to check the factory specs on that $100 iMac listed on Craigslist.