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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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Joplin
Joplin - the secure note taking and to-do app with synchronisation capabilities for Windows, macOS, Linux, Android and iOS.
Big plug for Obsidian. Lots of plugins related to TTRPGs, and customizable as markdown. And best of all it's free.
I use my own custom software. You can check it out here https://github.com/jrommann/UltimateGMScreen/blob/main/README.md
Joplin is an open-source notepad app much like Evernote and Onenote. It syncs with most cloud storage services, and it has all that I need and none that I don't.