Proofy - Quickly validate and verify your email lists.
RingLead - RingLead offers a complete end-to-end suite of products to clean, protect, and enhance company and contact information.
BriteVerify - Email Validation & Email Verification reduces bounce rates up to 98%. Rapidly verifying email addresses has never been easier, just drag drop and deliver!
BizProspex - BizProspex offers CRM data cleaning solutions.
Trumail - Free email verification API
Cloudingo - Cloudingo - a cloud-based SaaS, connects to Salesforce and allows system administrators to scan their entire database for similar or duplicate records.