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github-orgmode-tests
This is a test project where you can explore how github interprets Org-mode files
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QOwnNotes
QOwnNotes is a plain-text file notepad and todo-list manager with Markdown support and Nextcloud / ownCloud integration.
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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.
Org mode, once you've configured it to your liking, will probably do all you want (and lots more you haven't even thought of yet).
Personally, I use https://www.qownnotes.org. Notes are saved as Markdown files and are therefore easily readable. The rest of your requirements should be met by the tool as well.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.
Related posts
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Ask HN: FOSS notes offline app with navigation tree, ideally cross platform?
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QOwnNotes: Open-source plain-text file Markdown note-taking
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A wiki app like zim or cherrytree that actually supports markdown with a side-by-side viewer
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How did you choose between Joplin, Foam, Trilium, Obsidian, Logseq, Roam?
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Note taking software that isn't built with Electron?