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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
The core thing Obsidian does (technically did, as it inspired me to make my own note writing app) is that it removes the friction of brain dumping multiple streams of thought at once. If writing on one topic makes me think of another, I can link to it easily and see both side by side. I really liked the Sliding Panels plugin. It lets you have many notes open at once while still giving you good readability and accessibility. It let me really dive into whatever tangent found my brain's interest while writing without ever getting lost.