GoodBarber - GoodBarber is a mobile app creation platform.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Dropsource - Mobile development platform for building native iOS & Android apps
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Bizness Apps - Create your own app or become a reseller and build apps for others
Trumail - Free email verification API