ViralSweep - Grow your fans and increase sales with sweepstakes and giveaways.
RentHoop - Tinder for finding roommates
Retweet Picker - Retweet Picker is an online tool that is helping you to select the random winner from Twitter for the giveaways.
Housing Anywhere - The international student housing platform
KingSumo - Grow your audience with viral giveaways that cut marketing costs
Campus Cribz - College student rentals and roommate matching