Think about vertical markets you have had experience in. Odds are you have already created a solution for one client that would be successful helping others in the same vertical group.

Let's be partners.

Your only responsibility will be to maintain the source code. We will market the product, support it, and send you a royalty check every month.

Even after you retire, your royalty check keeps on coming.

See some of our products at http://trackum.com/