Personally I use MaxBounty and I just collected the current TOP3 "free download" campaigns for you:
1, Bring Me Sports - US with $0.31/EPC | $3.20/lead
2, TV Fanatic - US with $0.20/EPC | $2.75/lead
3, Command and Conquer Tiberium Alliance - MMO - US/CA with $0.09/EPC | $1.40/lead
If you have any question HMU anytime.