Wiki for emacs users

I am looking for a new wiki software for a small private network. Since all users are very addicted to emacs, it would be nice to make everything "emacs compatible". What wiki software is most suitable for emacs users? In particular it should be possible to navigate in the wiki inside of emacs (follow links etc.) and have a good mode which supports the wiki syntax perfectly. It's also important to be able to save changes in emacs easily (perhaps even save changes before committing it to the wiki). The wiki software should also meet other requirements, so it woul be nice if you could give multiple suggestions for a good emacs integration.