I've been looking for a Personal Knowledge Manager for a while (and been thinking about creating one). Feel free to message me if you're considering open sourcing or releasing it.

I'll let you know when I make the initial public release.

If you don't mind, could you ping me as well? I'm looking for a similar solution

Definitely. I'm turning the last corners on the mvp, and very eager to put it in front of people.

I very much want to talk about it, but it feels a little meaningless to do so until I've shipped it :)

Looking forward to it!