What chess "programs" do you like?

I have not played chess for a number of years. My chess board still sits on the dining room table in play but inert since my best childhood friend shot himself. We played over the years by letter, phone and then email thousands of miles away from each other. When he killed himself, I stopped playing. Never played since except for a few drunken nights when I tried "Titans" in my MS games. It kinda sucks.

Fuckin prick made it worse than a stalemate... when I get to heaven I am gonna kick his ass for that. Or, better yet, take his queen, bishops, rooks, and one knight and then run his ass around the squares in agony... heaven my ass.

I miss him. Dunno if I could ever play another human gain, So, what computer chess is cool?