I have used FocusMate for a while and it worked well for me. I stopped, mostly because I went back to working from the office, and I felt awkward doing FocusMate sessions with my colleagues hearing me. I probably should work through that at some point.
A couple of Beeminder users enjoy FocusMate and I think there will be an automatic integration at some point. Here is a thread about FocusMate in this forum: