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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.
I use a highly tweaked Tiddlywiki called mGSD for my work GTD system and the built in ticklers are nice. Digital-only, obviously. One nice feature is I can turn ticklers into projects or actions and vice versa so I can put things to sleep for a while and then re-integrate where they need to go. It used to be here but isn't working right now. If you're willing to futz a little, you can get an empty and a demo version here.
I use a highly tweaked Tiddlywiki called mGSD for my work GTD system and the built in ticklers are nice. Digital-only, obviously. One nice feature is I can turn ticklers into projects or actions and vice versa so I can put things to sleep for a while and then re-integrate where they need to go. It used to be here but isn't working right now. If you're willing to futz a little, you can get an empty and a demo version here.