Obsidian

[Skhilled]

Your thoughts are yours.
    Obsidian stores notes privately on your device, so you can access them quickly, even offline. No one else can read them, not even us.
Your mind is unique.
    With thousands of plugins and themes, you can shape Obsidian to fit your way of thinking.
Your knowledge should last.
    Obsidian uses open file formats, so you're never locked in. You own your data for the long term.

I've had this for about a month or so and looked at it brief several time. But this is the first time that I've spend a few hours playing with it and LOVE IT!!!

https://obsidian.md/

It comes with a number of plugins pre-installed and hundreds of community plugins that you can install through the app!