This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
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OmniOutliner
omnioutliner.omnigroup.com
did:plc:zp7kzwfpphfsf6m4tckhzyf6
Powerful outlining app for Mac, iPhone, and iPad.
Coming soon to Apple Vision Pro.
https://www.omnigroup.com/omnioutliner