Version of Benetl, the free ETL tool, in download is version 2.8 (06/20/2009).
You should update. A version for Linux is available.
This release is a mature one, you can use in a production mode.
Please read about "part formula" in documentation, in order to see possibilites that Benetl brings.
You can use the forum to ask questions and find help.
Benetl is a freeware you can freely download, use and redistribute.