Early Retirement Extreme Forums

This website has not been mentioned on the forum since 2015 so bumping it up here. A TON of projects:
https://www.appropedia.org/Welcome_to_Appropedia

OpenSource Maker Book:
https://www.appropedia.org/Create,_Shar ... ce_Ecology

ETA---
Appropriate Open Source Tech:
https://www.appropedia.org/Open_Source_ ... Technology

Interesting. It's more than "just" a list of projects.

E.g. here's how to file metals: https://www.appropedia.org/Filing_metal