Trillium Notes is another one that allows for the same node to be available in multiple branches. It's pretty good - but the focus on rich-text content primaril

Trillium Notes is another one that allows for the same node to be available in multiple branches. It's pretty good - but the focus on rich-text content primarily became frustrating for me and got in my way and I started looking at other options. I then found exporting/migrating my data with those concepts was challenging, since it ends up being proprietary with no easy export option - at least no easy export that then cleanly works in other products. The markdown world has some contenders with embeddable links that allow you to include notes from multiple locations (like an iframe, basically) - Obsidian.md being one such example.