UI Movement - The best UI design inspiration, daily
Retweet Picker - Retweet Picker is an online tool that is helping you to select the random winner from Twitter for the giveaways.
Design Hunt - Curated design inspiration for everyone
Tweetdraw - Tweetdraw is an online tool that provides an easy way to pick a winner for a giveaway, having a quick Twitter Quote Draw, Instagram Comment Draw, and Twitter Retweet Draw.
UI Jar - Hand-picked design inspiration for your real life projects
Giv - Snapchat & Instagram giveaways made easy