Conversational Form - Turning web forms into conversations. By SPACE10
Retweet Picker - Retweet Picker is an online tool that is helping you to select the random winner from Twitter for the giveaways.
Typeform - Create beautiful, next-generation online forms with Typeform, the form & survey builder that makes asking questions easy & human on any device. Try it FREE!
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.
Clearbit Forms - Data powered web forms designed for conversion
Twesocial - Twesocial helps you grow your twitter with real twitter followers. Real results, real people.