Ideally we can support good software by donating to it but this is challenging to. Perhaps a software store for various platforms that defaults to charging money for open source software you haven't already paid for. Let the user set a multiplier that effects the price so it is reasonable for that user and let the user also change the price if they desire. They CAN pay zero for insert filezilla competitor here but the default is 3.99. This is probably already more than for example filezilla makes for selling out their users.