Hey! Showing off a project I've been working on for a while. Peanut Split is an expense splitter where the room is a link. There are no accounts; people just join via the link.

Source: https://github.com/peanutprotocol/peanutsplit (AGPL-3.0).

One fun bit is that not only are 162 currencies supported, but you can also add any imaginary currency; gold doubloons, friendpoints, whatever you want, and just peg it with an exchange rate to a "real" currency (or not).

Also, receipt scanning works and other Splitwise "premium" features are fully supported.

It's free, open source, and as little telemetry as so on as possible.