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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.
As I've hinted to, I use it mainly for university. I am a History and Archaeology student an I'm currently in my first masters year. I use Obsidian to take notes in class, make summaries, study the material, annotating books and articles, and everything else that comes with studying. Besides this, I also use Obsidian as my personal journal or diary. I've long been interested in keep some kind of daily log but I never got into because I didn't have the right tools at my disposal. Now I try to make some sort of recollection of my day, everyday, but of course in practice I do it around 20 days a month, not every day. I also use Obsidian for personal projects or things I would like to look into more. For example I am currently working on researching the most well known celestial constellations, knowing their mythologies, recognizing their individual stars in the night sky etc. Another of my (growing number) of projects has as a goal to recognize edible or otherwise useful plants. Obsidian also became my place where I store my 'fleeting notes' or ideas. For this I've used multiple apps on my phone, which include (but are not limited to) Markor, Zettel Notes, Google Keep, the stock note app that comes on my Oneplus phone. But the app that I am now most happy with is called 'Fleeting Notes' made by Matthew Wong. I use it as follows: An idea pops in my head, this can be whatever it is, I write it down in the app, I add a title if possible, done. When I open my pc the next time I use a shortcut to import the notes made and they get placed in my 'Inbox' folder. From here I can decide to move them to my general notes that I can easily look up when I need them, or I can link and move them where they belong. So to summarize: I use Obsidian as my personal Wiki, everything in my life could be stored in here, in practice this is usually university stuff and personal projects.
The screenshot mid-page on this web page shows what it's like to show a portion of a graph using the Excalibrain plugin which also shows content in graph form