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app
Think fearlessly with end-to-end encrypted notes and files. For issues, visit https://standardnotes.com/forum or https://standardnotes.com/help.
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Joplin
Joplin - the secure note taking and to-do app with synchronisation capabilities for Windows, macOS, Linux, Android and iOS.
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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.
Standard Notes is really the gold standard here, but you'll have to pay (nominally) for their Tasks feature.
I personally use Amplenote for "planning and tasks" because I love how I can backlink things (Standard Notes struggles here with this..) and linking your thinking together with Obsidian is the gold standard for PKM. Amplenote is like a "simpler Obsidian with built-in tasks".