Adding this in a bit shyly. You probably have heard of Appropedia already.
If not, they are a wiki for appropriate technology, sustainability and reduction of poverty. The licenses for all their projects are open and they welcome new contributions.
WOW @NellKate No this is my first glance at Appropedia and its such an amazing resource, I hope it is okay that I took this out of a previous topic as it is deserving of its own listing in this space of sharing.
It has been around since 2006 as an open resource including over 4200 projects
Sometimes, Appropedia has been described as an “appropriate technology wiki”, but it is much broader than that —it is a green living wiki for all matters of international development and aid. Appropedia is an open site for stakeholders to come together and find, create and improve scalable and adaptable solutions. This can include sharing information and collaborating with others on how we can lighten our ecological footprint and live in harmony with nature and our environment in developed countries, or discuss for example low cost technologies for use in the developing world.
I like how there are ways to explore the resources from a geographic view (map) but also how everything is organized under categories for Sustainable Development Goals.