NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
TelephoneLists.Biz - Telephonelists.biz is the source for phone leads for sale, provides the agents with a wide audience full of leads ready to become the next customers.
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
LeadGibbon - Access millions of business contacts, with verified email addresses and phone numbers
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Salestools - Monitor your Linkedin newsfeed for keywords to obtain leads.