Factbook

Programmer-friendly Zettelkasten note-taking app powered by Prolog logic programming.

Desktopfreeglobal

Factbook is a free, open-source, programmer-friendly Zettelkasten note-taking app built on SWI-Prolog, letting users tag entries inline with parseable Prolog terms and then query and reorganize their whole knowledge base with real relational logic-programming queries rather than fixed folders or simple tags. It suits programmers and technical note-takers who want Zettelkasten-style atomic notes with genuine query power, though the project is early and still unstable.

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