It's not like we needed more reasons to love brothers David and Ian Marsh of NimbleBit. First off, they make terrific free (and lucrative) games like Pocket Frogs and Tiny Tower. Second, they're super nice and very supportive in the developer community. Third, they're humble and smart, keeping their company small and focusing on just developing good games rather than growing into a megacorporation. And now there's another reason to love NimbleBit: They're darn generous. Sign on San Diego reports that