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I’m 99% sure it’s obsidian with a LOT of extensions
This feature is called canvas, you can create one by clicking in this button
It does look like obsidian to me. People like this or logseq a lot for their note taking. If you want a foss alternative, you can look at Joplin, though I can’t recall if it has a graphing feature like this out of the box.
There is a draw.io extension for VS Code (like another comment mentioned, it looks like the main application is vs code), and the UI elements inside the open tab with grid looks like draw.io’s minimalistic dark theme.
Edit: yeah looks like it: https://marketplace.visualstudio.com/items?itemName=hediet.vscode-drawio
The screenshot you have in your post just has a different drawio theme than the default one. You can change the theme in settings of drawio.
Edit 2: Scrap that, it was proved to be obsidian based on LordeMostarda’s comment and answers below
Meanwhile, anyone know what addons they have here? I’d like to know what allows you to label the arrows.
Labeling arrows is built in. Just double click the line/arrow and it will give you a text field.