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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.
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ObjectCloud
A web-based operating system / web server with experimental distributed social networking capabilities
I tried the "Doc", "Sheet" and "Slide" feature and each of them are incomplete and lacks most of the popular features. It would be better if the author uses existing solutions instead of implement them from ground up.
editor.js [0] for documents and Grist [1] for spreadsheet are some good examples.
[0]: https://editorjs.io/
I built something similar many years back. Mine was web based: https://github.com/GWBasic/ObjectCloud
What I would tell my younger self is to spend more time reading through YC's resources about how to start a business. In my case, I built something that I thought there was a need for; but I should have spent a lot more time iterating off of tangible customer needs.
IE, I should have found a handful of customers who needed tight integration among these use cases and let their needs drive the implementation.
Why? There are already plenty of applications that do the same functions. (MS Office, Google Drive, ect, ect.) These applications are mature, and well-understood by the whole market.
I would suggest finding a few customers who are hampered by poor interoperability among 3+ applications / use cases, and focus on their use cases. It'll take you 15+ years to be as mature as products like MS Office, Google Drive, ect; but if you solve a niche's tangible, need, they won't care, because they can't operate their business without you.