Is there any free/paid multi-player (in LAN) poker software available? Please suggest a good one you know.
I have used DD Poker for the same scenario you are describing. It worked pretty well and has a pretty good single player simulator for when you feel like going solo.
There's also PokerTH, playable both via Internet and LAN.
There's AirPoker for iPhone/iPad. Wifi and BlueTooth play.
You could try Salus Technologies. Pretty decent software not sure the price will fit your budget.