Machining charts and spreadsheets

Came across this site:

which I hadn’t found before — looks look a good variety of information — curious what other folks find / think.

Notably useful page:

Page with table listing many opensource CAD apps: https://sites.google.com/site/lagadoacademy/miscellaneous-projects/free-cad-software---overview — includes columns for OS compatibility, incl. whether or no an app will run in Linux using WINE.

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