Windows/Mac/Linux (All platforms): Phun, a free open-source, cross-platform 2D physics simulator, makes you want to pick up blocks, or maybe crayons, and learn more about the way things fall and move under pressure. Written by a Swedish graduate student, the program teaches concepts of restitution and friction, so it's great to load up with the kids, but you'll probably find yourself sneaking a few turns by yourself at creating, and knocking over, shapes and lines. Phun is a free download for Windows, Mac OS X, and Linux systems; hit the link for instructions on using and having, well, fun in Phun.

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The web has democratised a lot of things since its birth, including the learning previously available only with a hefty tuition cheque. College site Education Portal has a handy list of the colleges that offer the most comprehensive course material online, including open-course trailblazers like the Massachusetts Institute of Technology and Tufts University, and programs like Stanford's lecture podcasts on iTunes U. You can't get a sheepskin for free, but you can further your knowledge and training for less than even the cost of a book. For way more college-based free learning, check out Wendy's comprehensive guide to the .edu underground.

Little appreciated outside the world of academia, there are literally thousands of .edu (AU - or edu.au, of course) sites bursting with incredibly useful and interesting information and resources. Most of these sites won't pop up to the surface of the average search engine quest, and so they wait, neglected and underused...until now. Keep reading for a quick tour through the mysterious underground world of .edu.

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