http://network.bepress.com/engineering/

http://www.areatecnologia.com/

http://www.amolasmates.es/geometriainteractiva/alumno.htm

www.cste.com  CS Tool Enginnering

www.metalwdigest.com  Metalworking Digest

www.sme.org  Society of Manufacturing Engineers

www.mmsonline.com 

www.ntma.org  National Tooling and Machining Association

www.metrologyworld.com  Metrology World

www.ansi.org American National Standars Institute

http://www.iso.ch   International Organizations for Standardization

www.isa.org  International Society for Measurement and control

www.e-plastics.org

www.injectionmolding.com