Bulk Email Verifier - Clean up your large mailing lists before you use them. Clean list increases your reputation in MailChimp, AWeber, or Campayn.
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
Email Verifier - Email verifier app lets you verify email.
Drupe - Next generation contact manager and dialer.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Simple Contacts - Contact lens prescriptions from home