Fed up with your old and boring Windows operating system? Are you thinking about changing to something unique? Do you prefer to challenge the forefront in an operating platform? Do you like to figure out what the structure of that operating system is likely to be like in its future release? Or maybe you want to test a platform that your mates are working with, to determine if you can add it to your personal computer. This article provides you with brief descriptions of different types of free operating systems that you can install and run on your PC. And these include platforms that are open source, so it’s also possible to customize or tweak the platform.