If I had $100,000 I would select a software idea that really solves a problem and develop it open source. I would be the only developer so would probably need $

If I had $100,000 I would select a software idea that really solves a problem and develop it open source. I would be the only developer so would probably need $2000 per month. So I would be able to program roughly 4 years with the money. Of course I would publish the code early on and when there would be enough traction I would found a non-profit organisation that would oversee the further development.