These links will tell you all you need to know about the variety of platforms available for your computing needs, from Windows and Macintosh to Linux.

Resources in this category:

Linux Planet :: http://www.linuxplanet.com/linuxplanet/
This site features "Linux news and tutorials for Linux system administrators."
Linux/Unix Tutorial Site :: http://www.ctssn.com/
This website offers free, practical Unix tutorials. Appropriate for people new to Unix.
Mac Teens :: http://macteens.com/magazine/
This site is the #1 destination on the web for teens who love Macs. Here you can find an active online community with message boards, galleries, news and more. The site also hosts a free e-mail service.
OSXGuide.com :: http://www.osxguide.com/
This site is dedicated to telling Mac users "how to do things in OSX." There is a bulletin board, list of OSX FAQ's, and OSX news. This site is also searchable.
The Penguin's Guide to Linux :: http://library.thinkquest.org/C003740/
This is a site designed to teach users some basics of this "revolutionary operating system." It has a variety of formats; the text-only version is available in French, English, German, and Spanish.