Gleam - Marketing apps designed to help you grow your Business
KingSumo - Grow your audience with viral giveaways that cut marketing costs
SweepWidget - Run contests, viral giveaways, sweepstakes, leaderboard competitions, and instant rewards campaigns. Quickly grow your email list, social media followers, website traffic, and qualified leads.
ViralSweep - Grow your fans and increase sales with sweepstakes and giveaways.
Rafflecopter - Rafflecopter is a web app that makes it easy to run a giveaway promotion.
Retweet Picker - Retweet Picker is an online tool that is helping you to select the random winner from Twitter for the giveaways.