Talend Open Studio vs Pentaho Kettle, a comparison

Talend Open Studi (TOS) and Pentaho Data Integration (Kettle) are two comprehensive and widely used Open Source ETL tools. ETL (Extraction Tranformation Loading) is the process in which data is extracted from different sources (database, file, web services, etc), is then processed (value replacements, computations, etc) and finally loaded on another destination (database, file, web, etc). ETL is a key process in Business Intelligence and Datawarehouse management.