Org mode in Emacs... it’s old, but it works. It hyper links. It exports to almost any format. It lets you have complex notes. It can do agendas. It’s awesome at searchable notes. It’s plain text.
Designing cool spreads, adapting others and making cool sketches on the covers was fun and the tactile nature of the tooling was nice but org-mode on a laptop works a lot better and is a lot less work to maintain.