Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.

Turtl - The secure, collaborative notebook

Tyke - Mac menu bar app that @torrez really needed to take notes

Omni Notes - Note taking open-source application aimed to have both a simple interface but keeping smart behavior

Thought Train - Stop using sticky notes to remember what you're doing 📒 🚫

Tomboy - Apps/Tomboy - GNOME Wiki!