https://geargenerator.com
It only costs US$ 2 for use all day but you can use for your design without download for free.
You really don't need a cad program -just send your drawings to a laser/waterjet cutting service.
THANKS OZ. OY OY OY.
This is far more than just a useful tool. Its a god send. $25 for unlimited d/l? So much worth it. I even saved it to my drive for safe keeping too.