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dstat is a versatile replacement for vmstat, iostat, netstat, nfsstat, and ifstat. It includes various counters (in separate plugins) and allows you to select and view all of your system resources instantly; you can, for example, compare disk usage in combination with interrupts from your IDE controller, or compare the network bandwidth numbers directly with the disk throughput (in the same interval).

GNU Parted is an industrial-strength package for creating, destroying, resizing, checking and copying partitions, and the file systems on them. This is useful for creating space for new operating systems, reorganising disk usage, copying data on hard disks and disk imaging. It contains a library, libparted, and a command-line frontend, parted, which also serves as a sample implementation and script backend.

Logwatch is a customizable log analysis system. Logwatch parses through your system's logs for a given period of time and creates a report analyzing areas that you specify, in as much detail as you require. Logwatch is easy to use and will work right out of the package on most systems.

memtester is a user-space utility for testing the memory subsystem in a computer to determine if it is faulty. It does a good job of finding intermittent faults and non-deterministic faults. It has many tests to help catch borderline memory. memtester should compile and run on any 32- or 64-bit Unix or Unix-like system.

minised is the fast, small sed originally distributed in the GNU toolkit and still distributed with Minix. The members of the GNU Project removed it when they built their own sed around an enhanced regexp package, but it's still better for some uses (in particular, it's faster and less memory-intensive).

rlocate is an implementation of the "locate" command that is always up-to-date. The database that the original locate uses is usually updated only once a day, so newer files cannot be located right away. The behavior of rlocate is the same as slocate, but it also maintains a diff database that gets updated whenever a file is created or a directory is moved. The rlocate kernel module can be compiled only with Linux 2.6 kernels.