Verifier - Weed out disposable, non-existent domains or invalid emails.
Retweet Pick - Retweet Pick is a random name generator for Twitter giveaways via generating a winning name from the list.
Email Verification on Google Sheets - An add-on for email verification directly in Google Sheets
Twesocial - Twesocial helps you grow your twitter with real twitter followers. Real results, real people.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Tweet Attacks Pro - The best Twitter tool on the market