OpenTMS is a full-function tape management system, similar to the tape management functionality long supported on mainframe computers. It provides commands and an API for storing and retrieving files / data objects to tape volumes in a tape library.
PRATIMA, an Asynchronous Remote Volume Replicator for Linux:
Pratima performs online, real-time, reliable and efficient block level data replication to a remote computer over a network in both synchronous and asynchronous modes for Linux.