RingLead - RingLead offers a complete end-to-end suite of products to clean, protect, and enhance company and contact information.
Oracle Data Quality - Overview of Oracle Enterprise Data Quality
BizProspex - BizProspex offers CRM data cleaning solutions.
SAS Data Quality - SAS Data Quality gives you a single interface to manage the entire data quality life cycle: profiling, standardizing, matching and monitoring.
TowerData - demographic data on email addresses
Microsoft Data Quality Services - Data Quality