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Another interesting crowdfunding example. People can submit proposals for a small fee, which are voted on by a whitelisted subset of the community. Proposals with >10% voter turnout and enough yes's get paid out. More info here.
These types of systems almost warrant their own category (there are definitely pros and cons to using a voting system!), but I'm not quite ready to break it out yet. 馃槈
Perhaps noteworthy: many of these proposals are about community and education, not code.