ZaapIT - Mass Merge, auto merge, duplicates cleanup, bulk edit, bulk update, bulk delete , mass lead convert
Clearbit - Clearbit provides Business Intelligence APIs
Duplicate Check - Start creating data happiness. Find, merge and prevent duplicate records in your Salesforce Organization.
Lead411 - Lead411 is the Top B2B Marketing & Sales Intelligence data platform for prospecting, contact enrichment, Bombora intent and list building. Get Verified Emails, Direct Dials and Company Intel to improve your sales pipeline.
Apsona for Salesforce - Apsona for Salesforce is an add-on application for Salesforce to manage the data.
Cloudingo - Cloudingo - a cloud-based SaaS, connects to Salesforce and allows system administrators to scan their entire database for similar or duplicate records.