https://www.knowledgefutures.org/
The Knowledge Futures Group builds technology for the production, curation, and preservation of knowledge in service of the public good.
Two projects of theirs that I found really interesting -
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PubPub - PubPub is an open authoring and publishing platform. It socializes the process of knowledge creation by integrating conversation, annotation, and versioning into short and long-form digital publication.
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Underlay - The Underlay is a free and open source system for structuring, storing, and aggregating open, distributed knowledge.