NetUD

NetUD was a hack to the UD software by Matthew Trent which you can still find on freshmeat.net.
UD tracked your Linux system's uptimes and produced nice little top-three pages and things like that. (Well, I thought they were nice - I wrote the HTML template stuff for UD <grin>, my first ever 'real' C programming.)
NetUD did the same, only it also looked at the uptimes of the systems on your network and produced a nice output page.
Sadly, I lost the source in a started-editing-the-wrong-directory accident :(
All I have left is one binary: here, which I have been running for about 2 years now!
One day I might start this project up again, probably from scratch and using the rwho information instead.

You can see netud running on my box here, if I'm online.
The template file used to generate that page is here.

I know that you shouldn't distribute binaries to GPL-derived stuff without releasing the source, but it seems a shame to keep hold of this. I do actually have some of the old archives I took, but I can't seem to get them to compile. If anyone would like to have a go at getting them to work, drop me a line.