PicoCalc: A fully-functional clone of VisiCalc for the PICO-8
Somewhat random, but spreadsheets continued to evolve after VisiCalc (obviously).Here is one by the inventor of VisiCalc, Dan Bricklin, on github: https://github.com/DanBricklin/socialcalcAudrey Tang (who happens to currently serve as the Minister of Digital Affairs of the Republic of China (Taiwan)) created the Node.js port of SocialCalc, EtherCalc: https://github.com/audreyt/ethercalcAudrey made a fascinating write up of SocialCalc for The Architecture of Open Source Applications    https://aosabook.org/en/v1/socialcalc.html