There's also Grist (https://getgrist.com) - SQLite based with Excel-like formulae in Python.

I run it on my NAS as my own private Airtable for calorie tracking.

Also Mathesar (https://github.com/centerofci/mathesar/) - PostgreSQL based

thanks, I've been looking at all the spreadsheet-over-a-database projects i can find, and hadn't discovered APITable yet! I have a very specific requirement (app where I want a few views to be collaborative spreadsheets and the rest more freeform html based pages reading from the same tables) and so far none of the popular projects has been quite suitable. (basetool might have but it's dead :()

Beautiful thank you.