facti.net

Disk Partitioning
Gparted

Repartition a drive without destroying the contents. This is very good for installing additional Operating Systems (OSs) on your harddrive without deleting the contents of the existing OSs.

Links: http://gparted.sourceforge.net/ 

Modem Control
Minicom

(nyt)

Items marked with (nyt) indicate I have not yet tested it. I've heard
it's good (so it has made it on the list) but have not yet tested it
myself.