3D Blackjack Trainer, as it says the name, is a nice trainer (or Black Jack How To) aimed at teaching people how to play Blackjack. It's open source and free in all the meanings of the word. It's currently in beta stage (version 1.1b). Try it and learn how to play Blackjack as a pro!

Mahjong is an ancient Chinese solitaire game. The goal is to remove all the Chinese dominoes in matching pairs. The Majhong City is the best demonstration of such a nice and interesting game. The latest version of Mahjong City has five different game sets and two tile sets with unlimited possibilities of gamelay ensuring almost endless puzzle play! It's suitable for new and experienced players, all ages. Don't miss it!

Pick'T Game Poker is free puzzle game based on well known Poker rules. The game should run on Microsoft Windows Vista, XP, 2000, 98 with DirectX 9.c or above.
A free game from brazilian Independent Games Developer Derlidio Siqueira (aka PJoe). Sadly, Derlidio didn't mention whether Pick'T Game Poker is a holdem or no holdem poker. But give it a try, anyway!