NASLite is a Network Attached Storage (NAS) server operating system designed to transform a basic computer into a dedicated file server. Utilizing highly optimized versions of Samba, uCLibc, BusyBox, and various other Linux tools, it provides SMB/CIFS, FTP, or NFS filesystem support. It accommodates multiple client OSes: Windows, Mac OS X, and Linux. NASLite offers SMART disk monitoring and large file support, and is incredibly easy to install and administer.
Finnix is a small, self-contained, bootable Linux CD distribution ("LiveCD") for system administrators, based on Debian testing. You can use it to mount and manipulate hard drives and partitions, monitor networks, rebuild boot records, install other operating systems, and much more.
Sstat is a kernel module for Linux 2.6 aimed at providing basic SCSI I/O statistics. While better tools exist for monitoring disk activity, SCSI (or Fibre Channel) tapes have been neglected so far. This module compiles out-of-tree and uses Kprobes to access the information needed so it can be used with "enterprise" kernels as well (where recompilation or rebooting are not acceptable).