I've been a happy user of tldraw as a whiteboard for ages. The offline bit is neat, but the killer part of this is that it also becomes a shared workspace that both you and an agent can easily edit + explore. Highly recommend firing it up, Develop -> 'Install Agent Skills', doodling something, and then asking your agent of choice to make some edits or riff on the idea.
I've been a happy user of tldraw as a whiteboard for ages. The offline bit is neat, but the killer part of this is that it also becomes a shared workspace that both you and an agent can easily edit + explore. Highly recommend firing it up, Develop -> 'Install Agent Skills', doodling something, and then asking your agent of choice to make some edits or riff on the idea.