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/

Center for Green Roof Research at Penn State University
Welcome to the Horticulture website, our address has changed to http://horticulture.psu.edu. We are busy both updating content and moving to a new system of managing our site. We apologize for the inconvenience as some of the material you are accustomed
http://hortweb.cas.psu.edu/research/greenroofcenter/

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 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

HomeInfoMax
The largest online source of property information and all types of Real Estate records. Search real property records by address, by owner name, by parcel number, research county data to find property owners, perform title searches, retrieve property reports and generate marketing leads.
http://www.homeinfomax.com/

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/