Memos - Simple note-taking for your everyday thoughts.
usememos.com
Memos is an open-source, self-hosted note-taking app that brings your everyday thoughts together in a personal timeline. Your data stays yours, and you choose what to keep private or share.

Interesting project. It is fun to share access with friends, and I like the fact you can create private user notes by default. Clients work well. So far, I like it quite a bit. Recommended!