I use obsidian but I wish there was an open source notes platform that could do what I want:

1. Excalidraw support ( or similar ) with PDF import and annotation support ( this is achieved by a plugin on obsidian )
2. Vim mode
3. Markdown for everything

I have tried so many notetaking tools and the closest I ever got was using xournalpp for PDF annotation and drawing, then writing plain markdown in helix / neovim, with a live markdown rendering pane on the side. Was just too clunky though.