With LiveShare PS you can now broadcast any Photoshop document to as many people as you want through an instant LiveShare meeting. If you make a change to your Photoshop document, they’ll instantly see your changes in the LiveShare meeting—you don’t even have to hit the save button!
A must have tool if you’re working together with others on projects. Works like a charm: organizes your cards (along with a description, checklists, and comments) in the (customizable) todo–doing–done columns, assign people and labels to it, etc.
Above that it’s free and iOS/Android apps are available too.