PM Canvas - Official App - for creating projects in a visual and collaborative way.

The Project Model Canvas is a blueprint for your project that’s meant to be completed collaboratively. It’s based on essential questions — ones that are part of any project.
The canvas is built using short snippets of text containing only essential information — the soul of the project.
Many people participate in its creation by placing notes with their ideas on the canvas. The canvas is flexible; it can be changed. Little by little, you’ll start to see both links and structural problems in the project.
After discussing and solving these problems, you’ll have a visual and concise representation of your project. This outline is ideal for quickly and clearly communicating what you plan to do and how to get there.

http://www.pmcanvas.com/