Trilium Notes

Hierarchical note-taking app for building personal knowledge bases.

Trilium Notes (maintained as TriliumNext) is an open-source hierarchical note-taking application designed for building large personal knowledge bases. It supports a tree of notes with cloning, attributes/relations, scripting, encryption, and a built-in WYSIWYG and code editor, and can run as a desktop app or a self-hosted server. TriliumNext is the community-led continuation of the original Trilium project.