I started out using designspark mechanical (free), but it's kind of weird and also also a crippled version of spaceclaim. You can easily make stl's for 3D printing, but the "real" cad formats require you to pay an exorbitant amount to export as them.

I'm just a hobbyist but it seems like fusion is the best value right now if you need a commercial-style cad cam product. I am constantly kicking myself for not focusing on it more than I did