I don't remember seeing any list of poker platforms. In this section, almost all the casinos accept Bitcoin (Otherwise they would be in the altcoin section) and you have to check manually which one has Poker. I feel like most casinos with 3rd party game providers have poker options for their players.
That would be not the poker game as what is wanted by OP because I believe OP is looking for pvp poker while if we are talking about 3rd party providers, most of them are video poker where players play against the house.
yahoo has mentioned some pvp poker sites and I think those are the most known poker sites in this forum, there can be some others but I dont think they are having enough traffic.
PVP poker can be said as a game that is not really popular in this crypto gambling industry compared to other games such as dice, crash or even slots.
This is why there were small number of crypto casinos that provide pvp poker games.