Download
Choose how to run DDN.
Free, open-source viewer, designer and verifier under GPLv2 or later. Choose modular tools or complete single-file utilities, with all 151 adopted profiles supported.
Modular tools
Open Viewer, Designer or Verifier. For offline use, download the complete folder as a ZIP, extract it and open the appropriate HTML file. Keep its chunks and resource files together.
Complete single-file utilities
DDN viewer
Read-only viewing, navigation, source inspection and supported snapshot capture.
DDN visual designer
The viewer plus authorized visual and source editing, history and lifecycle actions.
DDN verifier
Independent source, property, reference and semantic diagnostics.
JavaScript modules
For embedding, use these facades together with the shared modules/ directory. Downloading only a facade does not include its dependencies.
Saving your work
The designer returns edited source for download. The browser’s download action controls where it is stored. Opening the viewer or verifier does not alter your original file.
DDN is free for general public use under GPLv2 or later. No Weaver subscription is required. Keep the licence text, notices and third-party resource licences with redistributed copies. Visit the public DDN project for source and contributions.