Pentaho
https://pentaho.com/products/pentaho-data-integration

Download (free) Community Edition
https://pentaho.com/pentaho-community-edition/

PDI installation
https://www.hitachivantara.com/en-us/pdf/implementation-guide/three-steps-to-install-pentaho-data-integration-ce.pdf

PDI Manual 
https://docs.hitachivantara.com/internal/api/webapp/print/45066fe1-87b2-4864-9d9c-1225c5a260fc