A box blade is a type of implement used on tractors for smoothing and contouring land. It can have auxiliary hydraulics attached in order for adjustments to be made without leaving the seat of the tractor. It is attached via the three point hitch.
Snow and Grader Blade by Rustyiron -- Homemade snow and grader blade constructed from tubing, angle iron, steel plate, and channel. http://www.homemadetools.net/homemade-snow-and-grader-blade
Soil Trommel by David Waltman -- Homemade soil trommel constructed from lumber, metal hoops, metal screen, wheels, pulleys, and an electric motor. http://www.homemadetools.net/homemade-soil-trommel
Source 3point farm land leveler for tractors attachments; tractor rear frame leveler on m.alibaba.com
Chainsaw Attachments, Chainsaw Mills, Alaskan Sawmill, Log Building and Timber Framing Tools - Chainsaw Attachments/Accessories - Magard Ventures Ltd., Canada.
Diagram showing how a log is cut into sections - time to get our portable saw mill and get crackin!