someone I know posted the following names on my facebook post for this ea forum post:
but I am unsure which organization they are reffering to (could not quickly find websites for some of those)
and I could not find an obvious donation form for those
looks like to me that https://lesswrong.com/ has the same issue and I see that https://github.com/centre-for-effective-altruism/EAForum is a fork of https://github.com/LessWrong2/Lesswrong2 so I will post the same issue on lesswrong.
another incentive system/component I have seen is that forums will allow users not only to upvote but to give other incentives to good answers. stackoverflow has bounty, and reddit coins