Grasshopper
Manufacturer of mowers, commercial lawn mowers and riding lawn mowers. Kansas, USA.
http://www.grasshoppermower.com

Gardenweb: Lawn Care Forum
GardenWeb - The Internet's Garden Community
http://forums.gardenweb.com/forums/lawns/

Hayter
Makers of lawn mowers and tractors. UK.
http://www.hayter.co.uk/

Snapper, Inc.
Residential lawn care and snow removal equipment that's easy to use, easy to own and has the features you need for the way you mow.
http://www.snapper.com/

Gravely
Manufacturers of commercial and residential lawn mowers and rotary brooms.
http://www.gravely.com/

Lawn-Boy
Lawn-Boy makes walk behind mowers, zero turn radius mowers, and snowblowers that are designed to fit you.
http://www.lawn-boy.com/

Simplicity Manufacturing
Manufacturer of professional-grade lawn tractors, snowthrowers, zero turn mowers, riding mowers, and other yard power products - The Way to a Beautiful Lawn
http://www.simplicitymfg.com/

MTD Products Inc.
Manufactures outdoor power equipment including garden tractors, lawn trimmers and mowers.
http://www.mtdproducts.com/

Exmark Manufacturing Company, Inc.
Exmark offers the fastest and highest quality walk behind and riding lawn mowing equipment for both the landscape professional and estate/acreage owners.
http://www.exmark.com/

Husqvarna
Manufacturers and distributors of chain saws, lawn mowers, and specialty turf care equipment. Sweden.
http://www.husqvarna.com/