IYT
ItsYourTurn.com (IYT) is a turn-based game server including Go, Go-Moku, Chess, Chinese Chess, and other games. Based upon web browser access. Time limits are from 3 days per move to 45 days per move, but allow no byo-yomi.
Nodog: When I played there (about a year ago now), the scoring on the go games was horrendous. The players would have to score the games themselves to figure out who actually won, but the IYT server kept record according to its terrible scoring algorithm. For turn based games, I much prefer DragonGoServer.
Tim Brent: A lot of these disputes came from walls or territories not being fully defined and the algorithm counting them as dame. I still play there when I can find an opponent.