Syncmap is a program I'm working on that lets you manually build data maps for music. It's currently in the very early stages of development, and rather difficult to use unless you're the one who built it! But if you're not deterred by that, you can get it right here. Just unzip the folder wherever you feel like.
Download for Windows | Download for LinuxNote: This is a standalone application that I built on, and for, my personal device. I have not tested it anywhere else.
Syncmap is open-source and built in Godot 4.4 using C#. Guides/documentation coming soon...