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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.
Obsidian is free (as in beer) and open source but is not FOSS/libre. I almost exclusively use FOSS. But Obsidian is just better than anything else I've tried.
Link to source: https://github.com/obsidianmd/obsidian-releases
I love this. Honestly if this had the same tasking capabilities as minder https://github.com/phase1geo/Minder I might just make the jump to it. Using mind maps as a tasking app has worked out well for me.
This project looks very very hackable. Might do a pull request