Welcome to my world, where at least once a week, I have a conversation with a promising, early stage social entrepreneur.  Good idea addressing a major problem?  Check.  Innovative, business-driven approach?  Check.  Exhausted the small list of impact investors and patient capitalists, without having raised a dime?  Too often, also check.
There are some early stage funders out there.  Changemakers is a fantastic platform that offers money but more importantly, exposure.  The Gray Ghost Ventures family includes First Light Ventures, which offers promising early-stage companies up to $100,000 in investment.
Now you can add Innocentive, which we first discussed a year ago.  They are running a prize-based innovation fund, and their latest challenge specifically seeks "novel, unorthodox, and extraordinary opportunities for philanthropic investment."