Retweet Picker - Retweet Picker is an online tool that is helping you to select the random winner from Twitter for the giveaways.
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
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.
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
Twesocial - Twesocial helps you grow your twitter with real twitter followers. Real results, real people.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.