Pictured above (thank you, myatari.com) is AtariLab and it's as obscure a retro thingy as it gets. Before I send you off to read all about it in an Atari praising magazine piece of yore though, I'll give you some hints of what you should expect. Here goes: edutainment, physics, 8-bit, modules, biofeedback and science classes. Got it? Great! Now read the article.
Related @ Gnome's Lair: TI 99/4A, Chip's Challenge, the history of the FPS
Related Tags: AtariLab, Atari, retro, edutainment, 8-bit