This is a space for Wikis. An example is at example. How a wiki does authentication varies from wiki to wiki. Instructions on what the authentication scheme is for a particular wiki need to consult someone who: a) knows; and b) is willing to tell you. This is primarily intended as an easy place to put notes online. It is partly inspired by Obsidian, but is far simpler. A typical wiki will use only 800 lines of PHP for everything bar the code to do formatting (like e.g Markdown). You can, if your are careful, have many wikis on the same site, using symlinks so that they see the same source files for most things, as I do with the following wikis. A cleverer CMS takes too much code for my liking.