Freenode

freenode is a special-purpose, not a general-purpose, discussion network, currently implemented on Internet Relay Chat (IRC). It exists to support specific communities. It provides an interactive environment for coordination and support of peer-directed projects, including those relating to free software and open source. Our aim is to help our participants to improve their communicative and collaborative skills and to maintain a friendly, efficient environment for project coordination and technical support.
Physical address: 
United Kingdom

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There are currently 385 Commons-Based Peer Production cases!