Knave Blackjack was created by my friend Jason Follas. It realistically mimics the experience of playing blackjack in a casino, down to the texture on the table and the sound of the cards flipping out as they are dealt.
In its simplest form, the player receives 2 cards and elects to hit (accept another card) or stand (keep and play the cards dealt). The player competes against the dealer for the highest score without exceeding 21.
However, there are multiple options that allow you to add more players; change dealer defaults; and even select the dealer's next card by clicking a spinning deck. The game also includes information to help you learn blackjack, such as a "Hint" button; a "Strategy" diagram, indicating recommended moves based on the player's cards and the dealer's visible card; and a "How to Play" button that explains the rules of blackjack and this video simulation.
The free version shows an ad on the left, but you can pay $1.49 to remove all ads.
I found Knave Blackjack fun and educational, particularly for those of us who don't play blackjack very often. You can download this game at http://www.knave21.com/index.html.