RingLead - RingLead offers a complete end-to-end suite of products to clean, protect, and enhance company and contact information.
BizProspex - BizProspex offers CRM data cleaning solutions.
Oracle Data Quality - Overview of Oracle Enterprise Data Quality
TowerData - demographic data on email addresses
SAS Data Quality - SAS Data Quality gives you a single interface to manage the entire data quality life cycle: profiling, standardizing, matching and monitoring.
Cloudingo - Cloudingo - a cloud-based SaaS, connects to Salesforce and allows system administrators to scan their entire database for similar or duplicate records.