AMMDI is an open-notebook hypertext writing experiment, authored by Mike Travers aka mtraven. It's a work in progress and some parts are more polished than others. Comments welcome! More.
The Lisp Machine was developed at the MIT AI Lab and later commercialized by Symbolics, LMI, and Texas Instruments. It was well-loved but a commercial failure, and today is dead although various retrocomputing efforts exist. It was a computer system build from the ground up by hackers and as a result provided a level of power and flexibility that (rather suprisingly) hasn't really been matched in newer systems. It's kind of shameful that its wonderful features can't be found in present-day environments.