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Internet of things platform provider, developing open source urban sensors and other sensor networks in the scope of Smart Cities.
Smartcitizen.me is a platform to generate participatory processes of the people in the cities. Connecting data, people and knowledge, the objective of the platform is to serve as a node for building productive open indicators and distributed tools, and thereafter the collective construction of the city for its own inhabitants.
Wikipedia is a collaboratively edited, multilingual, free Internet encyclopedia that is supported by the non-profit Wikimedia Foundation. Volunteers worldwide collaboratively write Wikipedia's 30 million articles in 287 languages, including over 4.4 million in the English Wikipedia. Anyone who can access the site can edit almost any of its articles, which on the Internet comprise the largest and most popular general reference work, ranking sixth globally among all websites on Alexa with an estimated 365 million readers.
LocalWiki is a grassroots effort to collect, share and open the world’s local knowledge.We want anyone, anywhere to be able to learn about where they live — their local government, the history of their neighborhoods, streets, social movements, noteworthy local figures, social services, schools – every facet of life in their community. And we believe that this vast collection of local knowledge should be created by the people who know it best - individual community members working together. There are already over 70 independent LocalWiki projects in 9 countries and in 7 languages.
Twine is an open-source tool for telling interactive, nonlinear stories.
Wikitravel is a project to create a free, complete, up-to-date and reliable world-wide travel guide. It is built in collaboration by Wikitravellers from around the globe.
Freenet is free software which lets you anonymously share files, browse and publish "freesites" (web sites accessible only through Freenet) and chat on forums, without fear of censorship. Freenet is decentralised to make it less vulnerable to attack, and if used in "darknet" mode, where users only connect to their friends, is very difficult to detect.
Gnutella2, often referred to as G2, is a peer-to-peer protocol developed mainly by Michael Stokes and released in 2002. While inspired by the gnutella protocol, G2 shares little of its design with the exception of its connection handshake and download mechanics.[1] It adopts an extensible binary packet format and an entirely new search algorithm.
Athens Wireless Metropolitan Network is a grassroots wireless community, taking advantage of new, state of the art wireless technologies, to connect people and services. The network comprises 1120 backbone nodes (as of Aug, 2010) and more than 2900 client computers connect to it.
A free, experimental network in Vienna, Graz, in parts of Weinviertel (NÖ) and Bad Ischl. It is build and maintained by computer enthusiasts. This project is non commercial. Is open for everybody interested and willing to contribute. One of the goals is to built a unregulated network which has the potential to bridge the digital valley between the social layers and deliver the infrastructure and the knowledge for it.

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There are currently 383 Commons-Based Peer Production cases!