From Green Policy
What is Appropedia?
Appropedia is the site for collaborative solutions in sustainability, poverty reduction and international development through the use of sound principles and appropriate technology and the sharing of wisdom and project information. It is a wiki, a type of website which allows anyone to add, remove, or edit content. Registration is encouraged but not required for contributors.
Appropedia has been described as an "appropriate technology wiki," but it is much broader than that - it is a green living wiki and a wiki for all matters of international development and aid. Appropedia is an open site for stakeholders to come together to 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 ie low cost technologies for use in the developing world. A key aim of Appropedia is to provide this information, to support sustainable choices - sharing knowledge to build rich, sustainable lives. For more about our motivation, see Appropedia:Mission.
Appropedia began in April of 2006. In the earliest stages it was a collaboration between passionate people from the United States and Australia, and quickly expanded to become a global project.
A number of other similar sites have "joined with" Appropedia since its inception, bringing many content pages, readers and contributors, including:
Sustainable Development Wikia WinWinWiki Wikigreen.org Village Earth's Appropriate Technology Wiki Project HowToLiveWiki, home of the Hexayurt The sGoals Wiki, a.k.a. the Sustainable Goals Wiki (sustainable business)
More details: Appropedia:A history of collaboration.  Content on Appropedia Appropedia wordle constructed from the 5,000 most popular content page names
Appropedia welcomes contributions of many types of content:
Project histories and project how-tos Textbook-style information, tables, and figures Best practice in sustainability, development and all related fields Designs Photographs and illustrations Information for finding supplies and help Links and information on other organizations Collaboration pages for co-creating solutions Discussion pages for commenting on work done and work that needs to be done More - whatever aids the causes of sustainability and overcoming poverty.