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.

I always liked planetary annihilation. It is really easy, looks decent, and has a native Linux version. That it's placed in a planet system makes it different to many other RTS.

Thanks for the feedback and kind words! Do you mean clunky ressource or UI wise? If it's UI wise feel free to suggest improvements in this issue

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.