Indie Fund is a funding source for independent developers, created by a group of successful indies looking to encourage the next wave of game developers. It was established as a serious alternative to the traditional publisher funding model. Our aim is to support the growth of games as a medium by helping indie developers get (and stay) financially independent.
Additional details about the need for Indie Fund and the rationale behind it were shared at the Game Developers Conference in the talk titled Indies and Publishers: Fixing a System that Never Worked.
http://indie-fund.com/about/
You can read more about the model at the above link. I can't help but think if maybe it would be worth it for some enterprising FOSS game devs to apply, and see if they can work out a deal. The only problem is the restriction is business model:
Can your game make money? Indie Fund is funded only by the seven indie developers who manage the fund. We have enough money to invest, but not enough to not care if we get it back, so another primary consideration is whether your game can make enough money to pay back the investment. This eliminates many games that generate revenue via sponsorships, ads, and donations, as well as freeware games. We are looking for games that can generate revenue via proven models such as downloadable console games, digitally distributed PC games, etc.
http://indie-fund.com/apply/
Though that still leaves room for other possibilities.
), while FOSS games rarely work like this (in fact I think they shouldn't even... the strength of FOSS is based on open collaboration and multi purpose devlopment, which of course has it's disadvantages too).