LispMachine

Roll your own

• LM-3 - Ressurecting the MIT CADR
• Lambda​Delta
• Running Open Genera 2.0 on LiGnux

Alternatives

• GnuEmacs, decidedly the modern LispM - bonus points if you use EXWM
• Mezzano, a CommonLisp OperatingSystem

See also: IncompatibleTimeshar