Lotame - Make your data actionable, learn about your most valuable customers, improve ROI by targeting the right audience and increase relevance across screens.
Cloudingo - Cloudingo - a cloud-based SaaS, connects to Salesforce and allows system administrators to scan their entire database for similar or duplicate records.
Adobe Audience Manager - Adobe Audience Manager is a data management platform that integrates online and offline data to deliver a unified view of all your audiences
CRMfusion - CRMfusion is a suite of data quality and data integration tools that integrate well with Salesforce.
Google Audience Center - 3 votes and 6 comments so far on Reddit
ZaapIT - ZaapIT offers a native suite of data quality and productivity tools for Salesforce. It enables administrators and power users to perform efficient and powerful data duplicate cleanups, incorporating smart reporting and visualization features.