CRMfusion - CRMfusion is a suite of data quality and data integration tools that integrate well with Salesforce.
RingLead - RingLead offers a complete end-to-end suite of products to clean, protect, and enhance company and contact information.
ImportBuddy - It gives you a very easy solution to Add/Update CSV data into any standard or custom object of Salesforce without leaving Salesforce.com
Data Ladder - Data Ladder is a data quality software helping business users get the most out of their data through data matching, profiling, deduplication
DataArchiva - The Next-Gen Data Management Platform for Salesforce
PCA Predict - PCA Predict is a customer data cleansing and enrichment solution.