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"Furthermore, there are three more business models for Open Hardware already implemented: 1. Free service for building a greater user base: Adafruit created Adafruit Jobs Board as a marketplace for designers, makers, programmers, artists, engineers and companies who want to meet and work together. This is a free service, but in order to use the job boards users must be Adafruit customers. 2. Partnership between Long Tail Open and Fabbing businesses: Ponoko has teamed up with SparkFun Electronics to enable its users to build custom electronics products combining Ponoko's laser cutting technology with a 1500+ strong electronics catalog from open source electronics supplier SparkFun. 3. Funding Open Hardware projects for getting good Open documentation: In August 2010, Bildr offered to fund original user projects in return for good documentation: in this way it would have promoted a bildr user by showcasing his/her work and paying for the parts to construct it. In return, Bildr would have got more information for its wiki, blog and community under the MIT software license.""

Tools for Conviviality. Ivan Illich, 1973. A very Important philosopher and a book about the idea of making tools which allow people to be autonomous and build links between users.

"E-democracy is a combination of the words electronic and democracy. In an evolving political and technological landscape here on Earth, many are fighting over the definition of this term. But a logical definition adheres to the word itself: a democracy that has "electronic" characteristics. E-democracy does not equal e-government, but is a form of it. It does not equal "wikigovernment" but is a form of it. Of course, defining "e-democracy" can be just as difficult as defining democracy when you get down to brass tacks. But because the Internet connects millions of people and can be a tool for governance, e-democracy has the potential to become one of the first forms of large-scale direct democracy on Earth. Canada and Sweden are now both trying to enact forms of this system of government, by working within the traditional political process to elect e-democracy friendly politicians, with the ultimate goal of overhauling the entire system of their nations' governments. Sweden's party Aktiv Demokrati aims to build a genuine direct democracy; Canada's Online Party has taken a milder approach with citizens in a more advisory capacity."

Here is 10 Free and useful computer-aided design software. Computer-aided design (CAD) is a combination of computer programs and systems that allow engineers and architects to design detailed two- or three-dimensional models of physical objects, such as mechanical parts, buildings, and molecules. It specially used to design curves and figures in two-dimensional ("2D") space; or curves, surfaces, and solids in three-dimensional ("3D") objects. There are so many "free" CAD programs out there but only a handful are either really free or useful. 

schemes and images on googleimage, showing the large panel of structural options to build a biogas digester, and also the common elemenst of each technical plan

The author of this HowTo biogas digester might be a good resource person : http://www.greenoptimistic.com/about-us/ "To construct a good biogas plant, you should not only respect the dimensions as indicated on the drawing but also follow the correct construction method. Hereunder, in a step-by-step fashion, the right construction method of the 2047 design GGC model biogas plant is given."