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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.
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rtnF
A web-based notetaking app. With WYSIWYG editor, support linking to other notes (wikilink), image paste support, basic formatting, autosave feature.
Thank you for the great TLDR :) Some slight corrections and comments below.
1. https://github.com/flancian/agora does not contain actual user content currently (see 4. for historical context), but rather serves as a "root node": it contains a base [[CONTRACT]] (for now just a document stating a code of conduct that all users must follow; might be expanded into something fancier using a blockchain) and pointers to repositories (currently one per user) that contain the actual content. You might laugh at how simple this currently is :) https://github.com/flancian/agora/blob/master/util/reset
2. Yes; the format is currently precisely Markdown plus [[wikilinks]] as an extension. [[wikilinks]] are "dead" by default in Markdown, being non standard; the [[agora server]] makes them go live by anchoring them to a context (an [[agora]] [[node]]).
3. Yes -- although [[agora server]] is currently unable to push changes upstream to user repositories, this is planned. For now it's just a renderer. Users use tools of their choice ([[roam]], [[foam]], [[obsidian]], etc.) to create and maintain their repositories. I use [[foam]] on VS Code.
4. Right now the Agora only pulls from user repositories as per 1.; eventually it will indeed pull from other Agoras, forming a federated network. Agoras will probably interact as long as their contracts are compatible.
I've been working on something like this too (knowledge graph research).
https://github.com/altilunium/Note : Forked from PmWiki
https://github.com/altilunium/rtnF : Re-written from scratch
I'm still struggling to differentiate this from a wiki, since its main feature is still the [[WikiLink]]. The best thing i could think up for now is to modify the wiki's UI and UX for personal note taking usage. To create "networked-notetaking application". Pivoting my research goal from "organization-knowledge-management" to "personal-knowledge-management".
The idea of "knowledge-graph-based social networks" is cool, but dont you think that the "post + comment thread" pattern, the "interest group" pattern and the "one-to-one direct communication" pattern are irreplaceable in a social network ?
Even the wiki itself is using a rudimentary system to simulate those pattern on top of its knowledge graph structure. Lot of people, communicating together by editing the same single page, just like using a single blackboard together. (For example, see the "Talk" page on wikipedia)