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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 Tasks (https://github.com/obsidian-tasks-group/obsidian-tasks) is more powerful than it may seem at first glance, because you can add tasks to any of your notes and fluently combine actionability with note-taking. It *does* require you to build a lot on your own, e.g. you need to decide whether you dedicate a note to be an inbox, where you store all kinds of task types, etc., and perhaps accompany it with other plugins (e.g. Quick Add).
I use the Obsidian TODO plugin in combination with the Reminders plugin.
I use the Obsidian TODO plugin in combination with the Reminders plugin.