Hi,
I share with you the web page with useful resources regarding low-cost and appropiate technologies using a design thinking approach. You can find experiences from different fields (agriculture, climate change, waste, education, energy and so on). If you're interested in one, I can try to contact them and ask if it is still an on-going project:
http://www.idin.org/resource-library
And here also international experiences of community development (including tools, successful cases, papers, etc) for local developers:
Just surf the websites and if there is any in which I can help, just ask me.
Here another inspiring social entrepreneurship related with sanitation in an indigenous community in Guatemala, which I commented last seminar: http://mosan.ch/