Thanks to Hippy, there is now a GUI version of L33TSig for Linux!

You can download it here

You will of course need Linux to run this. The daemon runs seperately from the GUI part, so you can use the daemon-only for any servers you want to. A small configurator app is being worked on for this purpose
For now you could use VMWare, PearPC or a similar application to run a simple GUI version of Linux to make the config.

Here is a screenshot of the GUI:

(Click to enlarge)

- Fr3d