We need to add a wiki to an already existing website, however we want only logged in users to be able to edit the wiki and we would prefer to use our own method of authentication.
Has anyone got any experiences with something similar or any suggestions of a good wiki engine for the job?
UPDATE: Thanks everyone, the general seems to be consensus is that ScrewTurn is one of the best Wiki's, however does anyone have any experience of integrating it into your own website?
Imagine you have the website with the basic layout done and you have an authentication system already.
How can you bring the engine into the middle of that so that your layout and menus surround the wiki and it uses your own authentication system?