options is a small and simple option parsing library for C programs. It is not designed to be fancy, but currently supports long and short options, default values for options, options incremented every time they're specified, and the display of a formatted table of options and their help message.
G2F3, a related project in Eiffel
I recently was made aware of G2F3 (http://freshmeat.net/projects/g2f3/), a project related to GGTL implemented in Eiffel.
Debian packages available
There are now Debian packages available. http://brautaset.org/projects/ (http://brautaset.org/projects/) has the details.