Seen a few people recently mention Lotus Improv, a fresh take on spreadsheets that didn't take off.
Original demo video from 1990, the really cool stuff starts around 6:30.
https://m.youtube.com/watch?v=rgGmKD87U3M&pp=ygUMbG90dXMgaW1wcm92
@plexus some of these ideas are present in Apple’s Numbers and they are the reason it’s been my favorite spreadsheet app for over a decade now.