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Design & ValidateToolOpen sourceFree
Zettlr
An open cross-platform writing and knowledge app combining Markdown, project folders, tags, full-text search, citation management, and multi-format export.
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Why it’s here
It keeps competitor notes, design arguments, and references in versionable plain text without proprietary document lock-in.
Best fit
Prototype systems, stories, and interactions, then validate them with real players.
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Before you commit
It prioritizes long-form writing rather than tasks or state graphs; live collaboration needs another layer, and large libraries require naming and linking conventions.
