KingSumo - Grow your audience with viral giveaways that cut marketing costs
Gleam - Marketing apps designed to help you grow your Business
Retweet Pick - Retweet Pick is a random name generator for Twitter giveaways via generating a winning name from the list.
ViralSweep - Grow your fans and increase sales with sweepstakes and giveaways.
Retweet Picker - Retweet Picker is an online tool that is helping you to select the random winner from Twitter for the giveaways.
ShortStack - Shortstack is a website that allows you to create viral online events for your social media followers or other online audience.