SiYuan is a privacy-first personal knowledge management system that supports fine-grained block-level reference and Markdown WYSIWYG. The platform offers a wide range of free features, such as block-level reference, two-way links, and various editing capabilities. Some advanced features are available to paid members. Users can install SiYuan via the application market, Docker, or Unraid hosting. The community is active, offering support and resources for development. SiYuan is completely open-source, with contributions welcomed. Data synchronization through third-party sync disks is not supported to prevent data corruption. Most features are free, with some privileges available to paid members.
https://github.com/siyuan-note/siyuan