arthor
I'm Arthor from Germany and found DokuWiki to be the best choice in terms of easiness and functionality.
My current installation is done for my choir, as an internal documentation tool. It's easy to handle even for our less computer-proficient friends, and can be read by our blind comrade as well (because of the clean and easy css structure).
Its not open to the public, but if you like to have a glimpse: http://www.chorwärts.de/ .
Best regards and keep on going, you are doing great work here! Thanks :-)