GEARCAM
GEARCAM app lets you draw 2 D gears in Auto-Cad very easily by just entering the gear dimensions of your choice or calculated values. The drawing can then be converted to a G-code file by using “GCODECAM” app to cut the gear in a CNC milling machine.
Standalone version of gearCAM is now available. You can download AutoCAM2D from this link and GearCAM is a module in AutoCAM2D.
http://autocam2d.com/downloads
For more details: GearCAM Help