There's a second Lisa emulator, idle (Incomplete Draft of a Lisa Emulator):

  https://idle-lisa-emu.sourceforge.net
There are quite a lot of activities around the Lisa right now. A number of projects recreate the Lisa hardware using (mostly) original components:

https://github.com/warmech/lisa-hardware/

https://github.com/alexthecat123/Lisa-PCBs/

https://github.com/alexthecat123/Lisa-GALSCSI-Card/

Patrick Schäfer has provided Lisa hardware and tools for many years:

http://john.ccac.rwth-aachen.de:8000/patrick/idefile.htm

and there is an Arduino-based ProFile hard disk emulator (currently only working with the Lisa 2/5 I/O board):

https://github.com/alexthecat123/ArduinoFile

...plus one based on a BeagleBoard:

http://www.arcanebyte.com/harddrive-product/

...bigmessowires' floppy emulator, which also works with Lisas

https://www.bigmessowires.com/floppy-emu/

...and, of course, the Lisa OS and application source code which was published in early 2023:

https://computerhistory.org/blog/the-lisa-apples-most-influe.../

...plus more interesting source code including GEM, e.g. available at:

https://stardot.org.uk/forums/viewtopic.php?t=20964

https://github.com/stepleton/