The stories of the ST (AMY chip http://www.atarimuseum.com/computers/8bits/XL/ASG/Chips/AMY/), STE botched launch (https://www.youtube.com/watch?v=oarR61SeY8E), Falcon (https://www.youtube.com/watch?v=cBTXGgb__y4), Lynx (https://www.mentalfloss.com/uk/games/36270/atari-lynx-the-wo...) and Jaguar (see other comments in this thread) all make great stories!

Some of the stuff that were done on the machines is jaw dropping - realtime raytracing on the Falcon for instance: https://www.youtube.com/watch?v=_cKRZ8QgH5o

Doom on the Atari ST (not Wolfenstein, more sophisticated with heightmaps, lighting, 64 colours etc): https://www.youtube.com/watch?v=QCvx2O5M69E

Complex texturemapping on Atari ST: https://www.youtube.com/watch?v=gHwUchzEG8k

Polygon landscapes on the Lynx: https://www.youtube.com/watch?v=DPexnRsNJDs