There's an active one called coinpoker that I used to use. I tried to log into it recently after not using it for a couple years and discovered my account was banned for some reason. Support wouldn't respond to my emails about it. So beware. But it had a lot of players on it. Both hold 'em and Omaha tables. All kinds of tournaments. I still get promotional emails from them all the time but I can't log in and play.