I am one of many people who really like the note-taking app called Roam that is currently in beta. However, it seems some think that bidirectional note linking is the primary feature of Roam, and while I think bidirectional note linking is a differentiator it is not the only reason why I prefer Roam. For me the main reason why I like Roam is that it is an outliner for developing and maintaining a wiki that automatically supports bidirectional links.
I’ve tried amplenote.com that claims to be an alternate to Roam that supports bidirectional links, and I does in fact do a very good job of importing content from Roam. However, Amplenote is not an outliner and I quickly found that true outlining, not just bullet lists, is a must have requirement for me.