Verifier - Weed out disposable, non-existent domains or invalid emails.
Retweet Picker - Retweet Picker is an online tool that is helping you to select the random winner from Twitter for the giveaways.
Validator.pizza - Free API to block 🗑 disposable emails
Retweet Pick - Retweet Pick is a random name generator for Twitter giveaways via generating a winning name from the list.
Antideo - Email, IP address and phone number validation API service
Twesocial - Twesocial helps you grow your twitter with real twitter followers. Real results, real people.