Walling for Windows - Visual walls for your ideas and projects. Now on Windows.
Milanote - Milanote is a note taking app for creative work.
Smart Notes - Sticky notes for your web browser
Unleash Business Creativity in Notion - Any idea can be a valuable one, if systematically developed.
Allo.io - Whiteboarding, documentation, and video chat in one place.
Four note boards - A simply stupid text tool to help think multidimensionally