Walling for Windows - Visual walls for your ideas and projects. Now on Windows.
Notational Velocity - Notational Velocity: modeless, mouseless Mac OS X note-taking application
Smart Notes - Sticky notes for your web browser
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.
Allo.io - Whiteboarding, documentation, and video chat in one place.
Notational - Notes at the speed of thought