I have DraftSight, LibreCAD, Sketchup (for larger projects, benches, sheds, piles and pillars for the house etc.) a Lieca program, a FARO program, and recently got Fusion 360. The tutorials that are available for 360 are great, and there are a lot to chose from. A small business that makes less than 100K a year can get a free licence. You download and install the program, and then when you go to activate it you select the option for hobbyist/small business and it gives you a key that unlocks everything. A few years ago I was using OMAX software that is used for the waterjet cutters and just using the tool paths to draw out what I wanted to print...... Not exactly it's purpose, but it worked well for me and I got it for free, so I wasn't complaining. I use Draftsight over LibreCAD, but that's just because it's setup more like the program that I use at work and it feels more comfortable to me. I'm still learning 360, but can see myself starting to use it more for knives as I get more familiar with it.