Great whiteboard alternative

We use InVision Freehand often when running UX workshops so we can have a dynamic way to move and show information in real-time when collaborating with different teams. We use it as a virtual whiteboard so we can have something already set up but we will need to move these things around as we are going through the workshop. It's a really helpful tool for working virtually. I also like that the learning curve for the tool is pretty low so anyone can jump into the Freehand to move things around or add their own ideas. After the workshop is complete, I will often use the Freehand output to begin my UX work in Sketch.