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.

Tomboy - Apps/Tomboy - GNOME Wiki!

Agenda - A date-focused note taking app for both planning and documenting your projects.

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

Ghost - Ghost is a fully open source, adaptable platform for building and running a modern online publication. We power blogs, magazines and journalists from Zappos to Sky News.

Turtl - The secure, collaborative notebook