Manual describing freeVikings installation (or, more exactly: installation of dependencies, because freeVikings are played without installation), invocation and controls.
Manual for developers of new levels (contains beginning of a step-by-step level creation tutorial; hopefully it will be finished one day) and for graphics.online version download archive
List of changes. (Plain text file.) Most recent are at the top. You can check it to know how active/unactive the project really is (if last change is a year old, it doesn't seem anyone's working on it... I always commit changes the same day I make them.)
List of tasks to be done. (Plain text file.) You can look there if you want to help and don't know where to start.