Building Composer
A free, open source, suite of criteria-based building design tools to support architectural programming and conceptual design.
http://bc.cecer.army.mil/

Green Home Building
Greenhomebuilding.com focuses on sustainable architecture, natural building, solar energy, ecology, water and forest conservation, recycling, greenhouses, adobe, cob, strawbale, cordwood, papercrete, earthbag and vernacular architecture, with related resources of books, videos and links.
http://www.greenhomebuilding.com

Whole Building Design Guide
Web portal for building-related information with a "whole building" focus provided by the National Institute of Building Sciences. Areas include Design Guidance, Project Management, Operations and Maintenance, Mandates and References, and Tools.
http://www.wbdg.org/

Wick Building Systems, Inc
Wick Buildings builds metal buildings, steel buildings, pole barns, storage sheds, machine sheds, farm buildings, horse barns, commercial buildings, municipal buildings and pole buildings.
http://www.wickbuildings.com/

US Green Building Council
Non-profit organization dedicated to sustainable building design and construction. Developers of the LEED building rating system. Listings of regional chapters.
http://www.usgbc.org

Earth Advantage Sustainable Building
Program started by Portland (OR) General Electric Company to support sustainable design of residential and commercial projects with consulting services and the Earth Advantage building certification program. Site contains technology reports, links to information sites, and listings of builders and events in the Portland area.
http://www.earthadvantage.org

Pitzrick and Associates, inc.
Providing partnering, strategic planning and value engineering support to the building industry since 1990.
http://www.pitzrick.com

Options for Change
Offering team leader training, building, assessment, performance, and support tools.
http://www.optionsforchange.com/

XooPS
Web application platform used for building dynamic Web sites. Provides community and support resources. [Open source, GPL]
http://www.xoops.org/

Modular Building Consultants
Modular Building Consultants provides mobile, modular, relocatable, temporary and permanent buildings. Modular Building Consultants builds prefab mobile and modular buildings from standard mobile layouts to complex multi-unit building systems.
http://www.modularconsultants.com/