Turfcutter is based on leaflet, a javascript mapping library, and allows for groups of contacts to be created from other groups of contacts by drawing polygons on a map. This is particullarly useful if you want to assign a volunteer to a section of land such as a street or neighborhood. This extension has strong integration with Civi-Campaign, meaning that surveys, canvasses, and walklists can be generated from the cut "turf".
Screenshot (click to enlarge)
