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Bounty system for FOSS Github projects?
(lemm.ee)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
There is rysolv which is under the AGPL but it probably needs some work (see this and this issues).
On the closed source side there is algora and replit.