For wifi authentication servers, google for nocat. The nocat folks themselves can be found at
http://nocat.net/ where they are
"developing NoCatAuth, the centralized authentication code that make shared Internet services possible."
There are others too.
Why no cat? Albert Einstein, when asked to describe radio, replied:
"You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat."
