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org-web
org-mode on the web, built with React, optimized for mobile, synced with Dropbox and Google Drive
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You might want to take a look at org-web[0]. It's a webfrontend for org-mode. But I think it could be used without Emacs as well. It's self-hosted and uses org files to store the data. It should meet most of your criteria. Not sure if it is still under development.
[0]: https://github.com/DanielDe/org-web
I love all these Roam Research style tools--always felt this was a really cool idea.
If anyone is interested in open source options, I'd recommend:
Foam - A Roam-inspired tool for markdown note taking--ahem, personal knowledge management (same features as Organizedly)--that runs on VSCode/Codium. I personally use and love it. Syncs across all my devices with Git, and deploys easily on free-tier Vercel, which is a nice way to check my agenda or read a note on my phone. https://foambubble.github.io/foam/
org-roam, for those emacs/org-mode people. I always wish I had the fortitude to become productive in emacs, but it seems it never will happen. https://github.com/org-roam/org-roam