There is SC and now sc-im: https://github.com/andmarti1424/sc-im

You can also literally run Lotus 123 if you want. Someone has binaries to make it work on linux. or under dosemu

Neat, thank you! sc-im looks amazing, and it's even in the Fedora repos (though the repo version doesn't support xlsx, so I'll compile myself and try it out)

Edit: Quite painless! Opened some test xlsx files without issue. Did get a stack trace on a very complicated one, so when I have time I'll try and dig in deeper. Added a doc to the wiki in case it's helpful to other: https://github.com/andmarti1424/sc-im/wiki/Building-sc%E2%80...