To me, Backup ARchiver is one of the functionally most versatile archive software available for Linux. It is also available for other platforms like BSD and MacOSX. Functionality includes backup to disk and block media as well as server based backups. Encryption and compression are self-evident. The program offers all major backup styles: full, incremental, differential and even partition snapshots. BAR can be used for command line but also comes with a server daemon and barcontrol, a well designed front-end GUI. The program is being taken care of by a friendly programmer. Thank you, Torsten !
An open, cross-platform journaling program.
A scientific plotting package.