Here are some examples of the Platforms I personally use for my Contests. These and a Few others are how I built my current list. Please visit each just to see how they work and why they are worth the cost!
Raffle Press
King Sumo
SociMonials
WishPond
Vyper
Giviofy
Last Chance, In case you missed it
Get Quick V Card Here
Frank's Personal email -
[email protected]