Makers of the 84" Ginzu Groomer used by RASC at Quarry Hill, YTS takes great pride in continually improving their design of light weight yet extremely effective groomers for XC trail grooming by snowmobiles.
Their G2 groomers are used for high quality grooming on many trails including the Birkie Trail.
A small company based in Superior WI, they make a wide, light weight aluminum pan-drag type groomer.
They make a variety of packing and renovating drags as well as a tracksetter. This site also has a number of good tips and techniques about grooming.
This Swedish company has what appear to be heavy duty track setters and grooming equipment.
One of the least expensive grooming solutions, its popular with the home groomer.
This page has a wealth of information of grooming equipment and sources of parts for building grooming drags.