[rmcastil]

Exactly. In one case I was associated with the work was done with a collaborative research grant. A laboratory had the need for a custom Laboratory Information Management System (LIMS). We built the software as they specified but retained ownership of the source. I know it sounds crazy because it's a win, win situation. Then we were able to market/sell that software to labs that had the exact same need (a niche market). Then years later I was able to secure a support contract for the original lab because I was the only one willing to support it. Which has in turn, turned it very specialized freelance work. All of which can be considered recurring revenue.