Simple, easy to setup and use gallery plugin for WolfCMS. It was built for several clients and modified to be somewhat dynamic but is not quite complete yet.
Download or clone the repository into /wolf/plugins/gallery. When the plugin is enabled for the first time the database tables will be made for it. Under /wolf/plugins/gallery/models is the schema for the items and categories so you can choose what fields you want and use, just be sure to uninstall and re-enable the plugin if you do so (Note: This will delete all data, so choose the fields you will use before entering data).
Bedeabza for the PHP Image class that is being used for thumbnail resizing.