libcaca is the Colour AsCii Art library. It provides high level
functions for colour text drawing, simple primitives for line, polygon
and ellipse drawing, as well as powerful image to text conversion
routines.

'D is not GLib' utility libraries.

SpanDSP is a library of DSP functions for telephony, in the 8000 sample
per second world of E1s, T1s, and higher order PCM channels. It
contains low level functions, such as basic filters. It also contains
higher level functions, such as cadenced supervisory tone detection,
and a complete software FAX machine.

Wget enables you to retrieve WWW documents or FTP files from a server.
This can be done in script files or via the command line.

cpuid executes the CPUID instruction on x86-family CPUs and decodes the
results into English descriptions. It knows about Intel, AMD, and Cyrix CPUs,
and is fairly complete.