Regrettably, due to spawning of spam pages - only registered users may make edits.
MediaWiki is the software that run Wikipedia -one of the biggest and baddest anywhere (listed as number 7 in web traffic by alexa.com on 2014-12-08.
Opensource - ready for anyone to use.
WhatNotWiki runs on it.
It's open to the public. But this openness is causing some problems, so I am narrowing the openness.
Extensions to Limit Spam