MITCalc - Spur Gear Calculation 

Geometric design and strength check of spur gear with straight and helical toothing. Application supports Imperial and Metric units, is based on ANSI/AGMA and ISO/DIN standards and support many 2D and 3D CAD systems
gearing spur gearing gear tooth toothing design strength check helical iso 1328 din 3990 ansi b6.1-1968 agma 2001-c95 agma 908-b89/95

MITCalc - Bevel Gear Calculation 

Geometric design and strength check of bevel gear with straight and helical toothing. Application supports Imperial and Metric units, is based on ANSI/AGMA and ISO/DIN standards and support many 2D and 3D CAD systems
gearing bevel gear gear tooth toothing design strength check helical din 3971 din 3991 iso 1328 din 3990 ansi b6.1-1968