Open Source Architecture book is a collaborative effort to draft a strategy for future endeavours on the meandering line between collaboration, technology, networks, labour, design and big architectural ideas. The book itself works as a manifesto and encyclopedia at the same time. Its tone doesn’t hide the fascination with digital prototyping tools, bottom-up networked collaboration, and citizen empowerment. Openly critical of 1960s participation projects and openly in favour of Linux, Creative Commons and Arduino, Open Source Architecture declares a state of change. At the same time it is an encyclopedia of architectural ideas, briskly summarized and put into relationships. From Ledoux, Bentham and Fourier to Le Corbusier and to Gropius, over to Habraken, Alexander, and Parvin the list of examples makes a tangible case for an Open Source revolution.