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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OmniPlan
omniplan.omnigroup.com
did:plc:hf6efo7cdqv6b44dz6tb7r4h
Powerful project management app for Mac, iPad, iPhone, and Apple Vision Pro.
https://www.omnigroup.com/omniplan