Decra Roof Systems:
Roof coverings using lightweight roof tiles for all roofs down to a ten degree pitch. UK.
http://www.decra.co.uk/

Roof Genius
Roof calculator, calculates a detail list of roof materials, and a complete estimate. Two ways to determine roof pitch. Offers tips and how to's on roofing. [Windows 95/98/2000/Me/XP/NT]
http://roofgenius.com/

Roof Products, Inc.
Manufacture prefabricated roof curbs and other roof accessories. Products include expansion joints, equipment supports, adapters, and ice deflectors.
http://www.rpicurbs.com/

Roof Coatings Manufacturers Association
Roof Coatings Manufacturers Association (RCMA) represents manufacturers of cold-applied roof coatings and cements. RCMA’s site offers product information and the latest roof coating news.
http://www.roofcoatings.org/

Fibreglass Roof Decking
Roof Decking From Dura Composites Ltd
http://www.roofdecking.co.uk

R.J. Hanlon
Robot protective covers, paint robot gun cOvers, thermal protective covers, lint free covers for protecting industrial robots manufacturered by RJ Hanlon.
http://www.rjhanlon.com/

WCAA. Window Coverings Association of America
Non-profit window coverings organization; provides membership and educational certification; searchable national directory of home fashions pros
http://www.wcaa.org/

American Hydrotech, Inc.
Hydrotech’s Green Roof, the Garden Roof Assembly is the latest innovation in roofing/waterproofing using MM6125 and 40+ years of successful installations around the world.
http://www.hydrotechusa.com/

Roof Menders
Tin Roofs: protecting our rich heritage against leaks and rust
http://www.roofmenders.com/

Roof Builder Tools
Architects using this AutoCAD shareware can quickly create any complex 3d roof model, then extract 2d elevations from them. Extrudes your your 2d roof plan into 3d solids.
http://www.roofbuildertools.com/