Here's a really intriguing & rich site. This is about community-scale development of practical farm technology.
http://www.latelierpaysan.org/
Somewhat similar to Open Source Ecology (Marcin Jakubowski's site)
http://opensourceecology.org/marcin-jakubowski/
But it's different in this way: Marcin is a creative engineer, coming at things in an engineer and fabricator's way. The other site is by farmers who know what they need and how it has to work.
The catch, for many people here on Permies.com, is the site is in French. However, it is easy to locate free-of-cost French-to-English translation online. You can translate any page with a copy and paste method, passage by passage. Believe me, this site is chock full of illustrations, plans, how-to directions. Check it out if you're shop-handy and serious about farming or market
gardening. The site's name means "peasants' workshop". Explore the site and scroll through.