Six small instruments for making things by hand, left out on the bench for whoever wanders in. Pick one up. Each runs in your browser, and most of them hand you a piece of paper to take to the real thing.
New on the bench: The Gears, a wooden gear train you can turn by hand, then print and cut.
And beside it: The Dovetail, a through dovetail you lay out, knock together, and print as a full-size marking template.
Each of these is one web page that does one job. Nothing you make here is sent anywhere. There is no account and no upload, and the pages are not allowed to talk to the network even if they wanted to.
When you are done, the page hands you something sized for the real tool. The rest is up to you and a free afternoon.