I know there a lifetime subscribers who are still delighted at the new things they discover. Phew! I can hardly keep up with all of it myself.

Geometric, Dimensioning, and Tolerancing Quick Reference.

Chatter Calculator to figure the right spindle speed to stop chatter.

Rigidity Calculator to help figure your tool rigidity.

Hardness Quick Reference with Rockwell (A, B, C, D, 15H, 30H, 45N), Brinell (Std, Hultgren, Tungsten), Vickers, and Shore scales.

CNC Servo and Stepper Motor Sizing Calculators.

Weights and Volumes for standard metal structural shapes as well as standard lumber sizes.

Fastener Database with dimensions for Socket Head and Flat Head Cap Screws.

Thread Database with all the dimensions, tapping drills, and more.

Fits and Tolerances for ISO 286, ANSI B4.2, and DIN 7172.

Geometry and Trig Calculators for Right Triangles, Oblique Triangles, Bolt Circles, Dovetails, Tapers, Chamfers, Drilling, Chords, True Position, Points, Turner’s Cubes.The ultimate productivity hack for busy people–the same ToDo list with Pomodoro timer system I use myself to get all this crazy stuff done for CNCCookbook.Fancy scientific calculator with automatic unit conversions and much more.

There’s a giant treasure trove of useful calculators, utilities, and reference information there including: You sign up for the free trial, and when that ends, even if you don’t purchase, most of the tabs will go right on working for you. We do a terrible job advertising it, but most of G-Wizard Calculator is free. In addition to all that, some of our software is filled with a ton of free features even if you never subscribe. We don’t believe in shipping software until it is great. Typically you use it for many months if not a year or two when that happens. In addition, when we’re introducing new products, we release them for free while in Beta test and don’t charge until we finish the software. We always provide a free trial for our software. Keep all that in mind as you check out our choices for the best Free CNC Software you can find. And sometimes free has sneaky hidden costs. We spend so much time fighting with the free software that in the end, had we spent just a little bit, we might have come out a lot better. Other times free makes us choose vastly inferior solutions. Sometimes free is totally awesome and there are no strings attached.

You may have heard the expression, “There ain’t no such thing as a free lunch.”

This may seem an odd way to get started, but I need to ask the question in all seriousness. Some of it is ours, some is from 3rd parties. We can help! Here’s your guide to the best free CNC software that’s out there. Quick: What’s the Best Free CAD Software out there? How about the Best Free CAM Software?

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