The Dink Network

The only one I've played is to the moon, which received quite stellar reviews. It's really an RPG telling the story about one character's life. It doesn't include any combat (as far as I've come anyway). I personally can't see why it got such stellar reviews, but I still believe it is a good buy if you're into story-telling RPGs. I enjoyed the part I played.

I don't know about any of the other ones.