Free Casino Sites differ from pay sites that offer "play chip" games. Some of these sites offer free gifts, cash and prize packages. They normally do so by having either pop-up advertisements, advertising or ways to get your tournament buy-in by visiting sponsors web sites.  

MSN Zone Casino
This site has Free online casino games, such as Blackjack, Caribbean Stud, Keno, Roulette, Slingo and Slots. They also have downloadable casino games you can purchase and ones from the GameSpring membership site.

Games.com/AOL Games Casino
America Online's merger with Games.com brought together some of the best casino games around.  Besides their Video Poker games, they have Slots, Keno, Catch-21, multiple Slingo games, Spanish 21 and Three Card

FREE PRIZES
 

Amigo Bingo Casino
Amigo Bingo offers free flash casino games of Roulette, Keno, Blackjack, as well as Slots, Video Poker and Pull Tabs.

FREE CASH AND PRIZES

Pogo Games Casino
Like all of the Pogo Games, the casino games like 21, Video Poker, Slots and Keno have cash and prize packages available. 

FREE CASH AND PRIZES