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"Open source hardware has a set of business models that include the following: Design distribution - Companies can pack sets of designs and sell the distribution just like Linux distributions. The OpenTech CD-ROM is an example of this method. Design technical support - Experts can give support for Open designs. Asics.ws is a company that follows this model by releasing IP cores and charging customers for technical support. Design implementation - Companies can implement the designs, sell them and pay royalties to original designers, according to their release license. Releasing - The release of open designs under the control of GPL-compatible licenses can occur whenever a silicon implementation is considered commercially." "

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. 

A Novel Design for a Biogas Generator in Developing Countries by Joanna Read A thesis submitted in partial fulfillment of the requirements for the degree of BACHELOR OF MECHANICAL ENGINEERING The proposed generator is designed to produce 3.2 cubic meters of biogas per day. This is the amount of biogas necessary for the daily cooking requirements an average family of eight people, the norm in Pabal. Initial conceptual designs are outlined and analysed by the use of a design matrix. The final design is also analysed and suggestions made for further improvements.

"Computer-aided design (CAD), also known as computer-aided design and drafting (CADD) , is the use of computer technology for the process of design and design-documentation. Computer Aided Drafting describes the process of drafting with a computer. CADD software, or environments, provides the user with input-tools for the purpose of streamlining design processes; drafting, documentation, and manufacturing processes. CADD output is often in the form of electronic files for print or machining operations. The development of CADD-based software is in direct correlation with the processes it seeks to economize; industry-based software (construction, manufacturing, etc.) typically uses vector-based (linear) environments whereas graphic-based software utilizes raster-based (pixelated) environments. "

"Even without considering radical projects like all the Open Money and Metacurrency initiatives that proposes new forms of currencies, we can think more about further joining existing currencies with microcredit certificates like the Open Source Hardware Reserve Bank ones. There is the need of accurate, portable and shareable tools of reputation ranking, able to interconnect different local contexts and attached to existing currencies. The Open Hardware still needs proper open-content licenses, since with current licenses we can protect the design but not the manufactured product or forks. And Open Hardware projects will have the need of warranties and conformance marks about the proper function of the manufactured product. Why don't we use the microcredit certificates for these tasks as well? We could design microcredit certificates to act as a conformance mark, warranty and license certificates as well: only the community can issue them and use them for its own self-organization." (http://www.openp2pdesign.org/2011/open-design/business-models-for-open-hardware/) "

"We offer design and support services for optimizing and scaling Solar Fire Concentration to your needs. To be cost-effective it's important to know exactly how big and how many Solar Fire Concentrators will meet your requirement. Likewise, it's important to adapt the design to the cost and availability of materials and to optimize the design for the intended application. By working with us you can go faster and farther for less cost."

"Open hardware companies are experimenting with different business models. Arduino, for example, makes money largely through design consulting. By creating a design community around their products, they stay in touch with the latest developments. They have also registered their name as a trademark."

"The current Open Source Hardware Draft Definition is intended to help provide guidelines for the development and evaluation of licenses for Open Source Hardware and it says that Open Hardware is "a term for tangible artifacts - machines, devices, or other physical things - whose design has been released to the public in such a way that anyone can make, modify, distribute, and use those things". The main difference with Open Source Software is that Open Source Software is collaborative, while Open Hardware is derivative:"

more results while adding the keyword "design" it seems the topic is quite largely documented

French philosopher Jacques Ellul, wrote one of the most reknown critique of Technology, The Technological Society, New York, Knopf, 1964 He explains that society lost control of Technology which is being completly autonomous. With DIWO-Lab, by making ourselves and rummaging into the design of things, we'll collectively master the Technology. From article "Jacques Ellul" Wikipedia (en): It is useless, he argues, to think that a distinction can be made between technique and its use, for techniques have specific social and psychological consequences independent of human desires. There can be no room for moral considerations in their use: "Not even the moral conversion of the technicians could make a difference. At best, they would cease to be good technicians. In the end, technique has only one principle, efficient ordering."

"The assessment of gross national happiness (GNH; Wylie: rgyal-yongs dga'a-skyid dpal-'dzoms) was designed in an attempt to define an indicator that measures quality of life or social progress in more holistic and psychological terms than only the economic indicator of gross domestic product (GDP)."

"What is Sociocracy? Sociocracy is a method of designing harmonious organizations, workplaces and associations in which each member is valued equally. It is based on creating self-optimizing systems that are effective and productive. The principles and practices were developed by Gerard Endenburg based on: Modern management theory and practices Quaker traditions of peace education and the valuing of each person Cybernetics, the science of communications and control"

"Democracy is a contact sport that everyone should play. Contrary to what we've been taught, it is not a spectator sport. It was specifically designed for amateurs and when professionals take over, they only ruin the game."

"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.""

The first result is inn English, it is the guidebook (12 pages) on "Preparing this training material all the important information have been collected from the booklets & research materials". Source : Biogas Training Center (BRC) Chendu, Sichuan, Chaina.

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."

Aaron from OSE headquarters writes : "as far as current research, we recently interviewed a man to help with our agriculture, and his current farm includes a methane digester designed by 'Biogas Bob':http://www.omega-alpharecycling.com/ "