Back in 2002, I took cleaned up the Siphon code and added functionality. It was a different world back then. There was not Github or even Google Code. In order to poke project maintainers and give them your additions to their code, you had to find out where in the seedy underbelly of IRC they hung out at. It probably was not EFnet, not that I would be found dead there. Also, they never responded to any of my emails to them. So, I made this fork of their code, back before forks were cool. Are forks cool?
The original repo of my fork can be found with the following command:
rsync -ai a.cvs.sourceforge.net::cvsroot/lawless/ .
But this repo is really for historical purposes. If you're really keen on passive OS detection, then you want p0f3. I really wish I had worked more on this project or advertised it more. I could have been as cool as lcamtuf. Who knew that passive OS detection would be so cool? Let this be a lesson to you younger programmers. Self-promote and build a community around your projects.