Image annotation

Those who need to tag or annotate elements within still images (e.g., maps, historical documents) may find the Image and Map Annotation Notebook interesting. ImaNote is a FREE open-source annotation tool that enables users to display and tag images online. It's based on the Zope open-source content management platform, which you would first need to install.

Of course, such functionality is widely available via Flickr (without Zope), but it appears ImaNote's user-base may be a bit more staid.