Official organizations

CETIM :
http://www.cetim.fr
ISO :
https://www.iso.org
AGMA :
http://www.agma.org

Control equipment

Frenco :
https://www.frenco.de/en/

Gear Publications

Gear technology :
http://www.geartechnology.com/
Gear Solution :
http://www.gearsolutions.com/
OHIO university Gearlab - USA :
https://gearlab.osu.edu//
Engineers EDGE (data knowledge):
http://www.engineersedge.com/gear_menu.shtml
Traité théorique et pratique des engrenages - G. HENRIOT - Ed Dunod :
https://www.dunod.com/sciences-techniques/engrenages-conception-fabrication-mise-en-oeuvre-0
MathCurve :
http://www.mathcurve.com/courbes2d/engrenage/engrenage.shtml
publications INSA :
http://lamcos.insa-lyon.fr/

Forums

Gear and pulley engineering forum :
http://www.eng-tips.com/threadminder.cfm?pid=406

Main suppliers of plastic materials for gears

Dupont :
http://www.dupont.com/
Celanese :
https://www.celanese.com/
Bayer :
http://www.bayer.com/
BASF :
http://www.basf.com/
Campus :
http://www.campusplastics.com/