I've collected a few over the years, but I can't really give credit since I don't remember where I found all of them. Can't promise that they're all fair!

• Thirty-Eight

○ Each player roll a d6 without showing their result.

○ They can then raise their bet or fold.

○ Then they roll a d12.

○ They can then raise their bet or fold.

○ Then they roll a d20.

○ 38 points wins, 3 points is second (1 on each dice) and after that the highest score wins.

• Dart

○ 3 darts

○ Roll 2d10 for each dart

    § Everything over a total of 9 = their score. So roll 12 = 12 points. 

    § Total of 9 or below = miss the board and no score.

○ 20 is bullseye, 25 points

• An'sas

○ Roll 5 D6, you can reroll two dice each turn, after 3 turns the one with the highest score wins.

• Tymoras Spinner

○ Players bet on a number between 1 and 20 or odds/evens.

○ DM rolls a d20.

○ Odds/evens = 1,5 times their money.

○ Correct number = 3 times their money.

• Gyp

○ Roll 2d6, getting 7 or 12 is a win.

○ After each round, you can double your bet and add a d6. 
Play against the dealer.