I don't want to get into specifics because I have abandoned their development and support a long time ago. The first one was a developer tool priced around $10,

I don't want to get into specifics because I have abandoned their development and support a long time ago. The first one was a developer tool priced around $10, the second one was a more generic IT productivity tool priced around $5. They've both made around $10-15K over the years. In the end I had to abandon them because sales started to drop more and more every month and continued development didn't seem to stop that.