Notational Velocity - Notational Velocity: modeless, mouseless Mac OS X note-taking application
Milanote - Milanote is a note taking app for creative work.
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.
Unleash Business Creativity in Notion - Any idea can be a valuable one, if systematically developed.
Notational - Notes at the speed of thought
Four note boards - A simply stupid text tool to help think multidimensionally