SiYuan

SiYuan is published by the B3log open-source team through the verified GitHub organization siyuan-note. B3log describes itself on its own site, b3log.org, as "平等•自由•奔放的开源社区" (an equal, free, unrestrained open-source community) and lists several named products it develops, including Symphony, Solo, Pipe, Vditor, Lute, and SiYuan Note, naming SiYuan as one of its own projects rather than a third-party integration. The GitHub org's own blog field points to https://b3log.org/siyuan, the SiYuan-specific page on that same domain.

Kind is set to vendor rather than community because B3log operates as a coordinated team shipping a defined, versioned product line under one consistent identity: a verified GitHub organization, its own domain, and an official Docker Hub namespace (b3log/siyuan, 3.59 million pulls as of 2026-09-15) whose description points back to the siyuan-note repository. That is a team publishing its own product across matching surfaces, not a loosely governed community project without a single identifiable owner.

SiYuan itself is described in its repository as "An open-source, privacy-first, self-hosted knowledge workspace where humans and AI agents work together," licensed AGPL-3.0, with 46,373 stars and 3,003 forks recorded on 2026-09-15. Its kernel ships a built-in MCP server, covered separately in this catalog.