Substance is a web-based document authoring and publishing engine developed in the open and available to everyone.
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Substance.io — Start using it
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Introduction — Learn more
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Internals — Technical Documenation & Installation Instructions
Substance is built on top of several independent components that are available as separate libraries:
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Data.js — Data Manipulation and Graph Persistence for Node.js and the Browser
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PROPER — A Semantic Rich Text Editor
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Letterpress — Cross Media Publishing for Substance Documents