ViralSweep - Grow your fans and increase sales with sweepstakes and giveaways.
Pack - Makes it simple to find the best roommates.
Retweet Picker - Retweet Picker is an online tool that is helping you to select the random winner from Twitter for the giveaways.
Roomr - Discover great people to live with
KingSumo - Grow your audience with viral giveaways that cut marketing costs
OurFlat - Groceries, bills, calendar, chores & chat for any household.