Casino games that run on play-money chips only. Each tool reports the expected value and house edge as you play, so what you take away is not a winning system but the price of every bet.
3 tools
Baccarat Trainer — Play baccarat with practice chips and see how far apart banker, player and tie really are.
Blackjack Trainer — Play blackjack with practice chips and learn the highest-EV move on every hand.
Casino Roulette Trainer — Spin a European single-zero wheel and see how payouts and the house edge cancel out.