t0mxd

I've used KitchenOwl for this (I'm the developer), it's FOSS but doesn't support multiple currencies. It has an overview where you can breakdown costs by categories and see who ows whom.

Thanks, you're right. I've updated the docs yesterday a bit and changed some links and forgot to update them on the landing page. For anyone looking for more screenshots, they can be found in the GitHub readme.

You could give KitchenOwl a try (disclaimer: I'm the developer). Has apps for iOS/android and other platforms.