I’m thinking of logging travel expenditures with a group of people, where different ones can pay bills for the group (or maybe part of the group). It would be the best if you can see how much the group or a person spent, how much you need to pay whom back at the end of a trip.

Bonus if it is FOSS.

Bonus as well if it supports different currencies but if you can log just numerical values and create multiple tracks of record, it is also fine.

Thanks!