More seriously, thanks for the link, good to know.
But for evsrv, don't worry too much about the license. Use it if you find it useful and this is all. I promise I will not sue you about it :-D!
Also seriously, despite its name, the WTFPL is no BS. As said on the license link, it's actually used, although rarely, for "serious" software, the type you can find in your favourite Linux/*BSD repositories. And the FSF recognizes it as a valid FOSS license (but not the OSI, I think).