Tools
IGen (July 2004)
IGen is a network topology generator based on network design heuristics such as MENTOR, MENTour, Delaunay triangulation and Two Trees. It is freely available here. Igen is written in Perl/Tk and I don't maintain it anymore. Don't use Perl if you want to keep your more than 10k lines of code project maintainable.
C-BGP (October 2003)
C-BGP is a BGP routing solver that I wrote in the framework of the IST ATRIUM and WIST TOTEM projects. it's main purpose is the computation of the steady-state of BGP routing in large-scale topologies. C-BGP is written in C and it is freely available here.
libGDS (October 2003)
libGDS is a library of Generic Data Structures. It contains most of the generic data structures required by C-BGP. It is now also re-used in other projects. libGDS is written in C and is freely available here.
YAPS2 (July/August 1997)
YAPS2 is Yet Another PROM Simulator. It is intended to be used with embedded systems using EPROM 27C64, 27C128 and 27C256. I wrote it quite a long time ago in order to participate to a challenge organized by the international journal of amateur electronics, Elektor. The project is available from Elektor's Microcontrollers in Competition CD (ISBN: 90-5381-086-2). More details can also be obtained here.