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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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QOwnNotes
QOwnNotes is a plain-text file notepad and todo-list manager with Markdown support and Nextcloud / ownCloud integration.
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noteworthy
Markdown editor with bidirectional links and excellent math support, powered by ProseMirror. (In Development!)
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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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neuron
Future-proof note-taking and publishing based on Zettelkasten (superseded by Emanote: https://github.com/srid/emanote)
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logseq
A local-first, non-linear, outliner notebook for organizing and sharing your personal knowledge base. Use it to organize your todo list, to write your journals, or to record your unique life.
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Joplin
Joplin - the secure note taking and to-do app with synchronisation capabilities for Windows, macOS, Linux, Android and iOS.
https://github.com/zadam/trilium :: another one
https://github.com/Joh11/brain-crawler local/web (react) tool, web-centric but usable for ZK purpose
https://www.zettlr.com :: Electron-based like Jopling, simpler, no attachment support
https://www.qownnotes.org :: NPM, though for OwnCloud
https://www.giuspen.com/cherrytree :: PyGTk/GTKmm, a bit buggy but lightweight and portable enough, you might like it
https://tiddlywiki.com and https://tiddlyroam.org single-page html+js local/web app with an optional Electron-based desktop UI :: they have the best transclusion support I know, give it a try, I do not like them but they have very nice points, a guide is here https://www.youtube.com/playlist?list=PLzZCajspPU_UjFn0uy-J9URz0LP4zhxRK
https://noteworthy.ink like Zettlr with better LaTeX/math rendering support
https://neuron.zettel.page :: CLI+webUI
https://logseq.com :: a FLOSS tool, but tied to GitHub...
https://joplinapp.org :: a bit buggy, Electron-based, but is one of the few that support file attachments