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Not just for OSS: it's also widely used (with the knowledge and acceptance of the admins by several LUGs, the W3, various Wikimedia projects, community wireless groups, and so on. Beyond that "official" list, it's also well-used by other groups for all kinds of purposes: for example, I volunteer with a non-profit which has used a Freenode channel for several years, but we're definitely not an OSS project! OSS certainly was what freenode was designed for, but they seem more than happy to support other kinds of communities too.