I'll start with my friend's software, OnCourt.

OnCourt - it's the best in the world tennis statistics analysis software. And it's not an exaggeration. It's enough to open and it use it for a while, and it all becomes clear. The author has worked hard on the usability and it's a pleasure to work with it.

It's not a pure betting tool, and is meant for all tennis fans, though I guess it won't be a big mistake to suppose that the main customers are, in fact, bettors.