This is super-early announcement. Since I could not find something similar to GRAIL developed by Rand corporation - I am starting my own - GRAIL-like system. Currently only simple drawing on canvas is implemented - I plan to add basic symbol recognition next. Code is here https://github.com/uprun/GRAIL-like I am using Godot game engine for this.

Can you say more about what GRAIL means to you? Maybe you have a particular paper or demo that shows the features you are interested in? Basically in the year 2024 it's fairly common to have drawing and group/ungroup, and I'm wondering what direction you're interested in beyond that..

Sure, here is the demo

Ah this looks familiar. 👀

The main idea is to use only stylus. I am looking into: 1. creating data-flow diagrams (no panning of canvas); 2. hand written text recognition (without replacing actual symbols); 3. use of sub-data-flows (like in arrows inside arrows video by @Lu Wilson ) 4. use of some ideas by Ink & Switch https://www.inkandswitch.com/capstone/

No I meant I'd seen the video before. "*only* stylus" was what I was missing.