Construction Management and Inspection

​​Civil

• American Association of State High​way ​& Transportation Officials (AASHTO)
• American Concrete Institute (ACI)​
• American Concrete Pipe Association
• American Concrete Pressure Pipe Association
• American Institute of Steel Construction
• American Society of Civil Engineers (ASCE)
• American Water Works Association (AW​WA)
• Asphalt Institute​
  
• Concrete Reinforcing Steel Institute
• International Code Council​
• International Slurry Surfacing Association
• International Society for Asphalt Pavements
• National Asphalt Pavement Association
• Rebar Design​

Electrical

• IEC - National Electric Code​
  
• IEEE Standards Association
• Institute of Electrical & Electronic Engineers (IEEE)
• Instrument Society of America​ (ISA)​
  
• International Association​ of Electrical Inspectors (IAEI)
• National Electric Code Internet Connection
• National Electrical Manufacturers Association (NEMA)​
• Test and Measurement Online (Resource for the test and measurement industry offering technical information about semiconductor, microelectronics, integrated circuits, microprocessors, & photovoltaics.)
  
• ​​​Underwriters Laboratories Inc. (UL)​
  

Mechanical

• American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE)
• American Society of Mechanical Engineers (ASME)
• American Welding Society (AWS)
• ASME Codes &​ Standards​​
• AWS Standards and Technical Publications
• Cast Iron Soil Pipe Institute​
• International Association of Plumbing & Mechanical Officials (IAPMO)
• Nickel Institute

​Coatings

• Steel Structures Painting Council (SSPC)
  

Miscellaneous

• American National Standards Institute (ANSI)
• American Public Works Association​ (APWA)
• American Society for Testing and​ Materials (ASTM)​
• Associated General Contractors of America (AGC)
• ASTM Standards​​
• California Board of Registration for Professional Engineers and Land Surveyors and Geologists
  
• Construction Industry Institute (CII)
• Conversion Tables
  
• CSSinfo​, Inc. (This site "provides one-stop, easy access to the latest technical standards and specifications from over 300 standards developing organizations worldwide.")
• Metric/US Conversion​ Factors for Construction (Including pipe, wire, rebar, pavement and more.)
• NFPA Codes & Standards
• Society of Women ​Engineers (SWE)
• The Construction Specifications Institute​
• U.S. Metric​ Association (USMA)​ (A good starting point for news on the metric assimilation. Includes links to metrication policy statements by many organizations such as ANSI, ASCE, IEEE, etc.)