https://help.sfdmu.com/
SFDMU - Advanced Salesforce Data Migration Tool | SFDMU Help Center
The SFDX Data Move Utility (SFDMU) is the top-notch modern salesforce data migration solution. It will help you to populate your org with data in minutes.
salesforce data migrationadvancedtoolhelpcenter
https://tfccs-opa.atlassian.net/wiki/spaces/CKB/pages/589332481/Data+migration+tool+for+Desktop+2.1+users
Data migration tool for Desktop 2.1 users - Concord Help Center - Confluence
data migration toolfor desktop