Obsidian is exactly this with a zettelkasten implementation. Instead of treating your notes as a linear thing, you access them like a non-linear database, utili

Obsidian is exactly this with a zettelkasten implementation. Instead of treating your notes as a linear thing, you access them like a non-linear database, utilizing filters, tags, a visual graph, and many other plugins. It's very interesting. I've been using it for a year. However, lately I've started to supplement it with paper notebooks as you can't beat pen(cil) and paper for a lot of things.