http://howto.nicubunu.ro/gears/ Drawing Gears in InkScape -Step by step instructions to drawing gears using InkScape by Ioana (Gabriela) Dulgheru
http://woodgears.ca/gear/ The gear template generator program is a program for printing paper templates for cutting out gears. It can do everything that the online gear template generator can do, and much more. Free trial version. Full version $26
http://507movements.com/index08.html 507 Mechanical Movements Gear Projects
http://www.makercase.com/ More advance box maker that generates a PDF but allows you to Flat Finger T-Slot joining
http://makezine.com/2012/04/13/cnc-panel-joinery-notebook/ SEAN MICHAEL RAGAN has been collecting clever ways of slotting flat stock together since he first read Nomadic Furniture back in 1999, well before the advent of the accessible hobby-class CNC tools that today make manufacturing parts like these pretty easy. Now, the world is full of people designing models, project enclosures, sculpture, furniture, and all kinds of other cool stuff to be assembled from parts made on laser cutters and CNC routers.