I use
Star Sapphire Common Lisp so I can pretend I'm using QBasic while I'm using Lisp.
P.S. Anybody remember this book? Make a raycaster in QBasic, don't mind if I do.
http://www.amazon.com/Revolutionary-Guide-Qbasic-Victor-Munerman/dp/1874416206/ref=sr_1_1?ie=UTF8&qid=1285967581&sr=8-1
2 new from $275.67 11 used from $2.52