fm project page
Most wiki software allows to include references to image files located on some remote WorldWideWeb server. ErfurtWiki permits this too, but it can additionally caches those referenced images, because of its database design.
This feature also allowed to implement a very easy to use image uploading function, which can be used to insert images into a page while you edit it (just see EditThisPage). This is usually allowed for all users and thus is likely to grow the sites` content very quickly, not only in means of text pieces, but instead more multimedia like.