Research for a socket server solution for multiplayer games, I came across these:
player.io – A socket server framework with features that are useful social gaming. Includes hosting plans
commercial socket servers
smartfoxserver
photon
open sourced socket servers
reddwarfserver
SlimIOCP
open source poker game
http://code.google.com/p/bluffin-muffin/
socket.io (javscript interface)
Haven’t really tried any yet. But I might have to choose one or look for more options in the coming days.