I'm currently trying to condense notes from my own FLOSS funding work, but for the moment I think it's helpful to see some of the great background research that the people over at the (mostly dormant) snowdrift.coop project have done.
Snowdrift.coop is NOT quite "mostly dormant", it's just pushing ahead at the unfortunately-slow-pace that is common for all-volunteer projects. Regular activity happens every day moving toward full launch. See the activity links at the top of https://blog.snowdrift.coop/still-here/
https://wiki.snowdrift.coop/market-research/other-crowdfundi... and https://wiki.snowdrift.coop/market-research/history/software give you an idea on the other funding options out there.