A Zettelkasten app (https://www.lesswrong.com/posts/NfdHG6oHBJ8Qxc26s/the-zettelkasten-method-1) on Teliva (https://github.com/akkartik/teliva), the rugged platform for little sandboxed text-mode apps that you can safely try out and tailor to your needs.

Today's demo was hosted on OpenBSD thanks to the gracious support of https://tilde.institute.