[Jabbermonkey]

Could be Clearfactr [1] which was a really interesting twist on spreadsheets, developed and built by a single person.

Clearfactr was acquired by Goldman Sachs in 2018.

It's been used internally in Goldman since then and they don't make it available outside the company unfortunately.

[1] https://www.clearfactr.com/

[lolive]

Found it:

https://www.ultorg.com/ https://x.com/hernantz/status/1521930369012047873