You could try wikimatrix and see if there's a good alternative for you there? I mentioned MoinMoin before, and really like it. But Moin 1 is getting old and Moin 2 is still under development. That said, i know web2py offers an integrated wiki (see The built in web2py wiki) and it allows mixing regular website programming with your knowledge management tool. I think it's really neat, though it might have a learning curve. You get all the web2py batteries included so you can have a wiki as a part of your development framework - or the other way around - use a development framework in documentation/knowledge management. Having access to all of that creates easier integration with other web frameworks using rpc/rEST etc. Which is what i have come to favor. Think of interactive reports based on database contents so you documentation can follow "live" changes.

I've built a documentation macro once to display the mappings inside a microsoft ILM servers management agent. All the knowledge was only visible through the UI by default. Creating wiki pages which i uploaded using WikiRPC even offered rough version management in which we would have a visual (wiki edit history) on what has changed. If you choose a similar path you might find some benefit in my search-and-replace script using wikirpc..

Penflip looks really nice and promising! The problem i or we have is that we host an information base for our customers. We have our own script language, more than 6 software products, for which we need online manuals and other projects.

So we need something we can host ourselfes, with the said features, like a wysiwyg editor, maintainable navigation and such nice things.