it's not "syncing" yet but https://sharetheboard.com https://sharetheboard.com does make it easy to save and send whiteboard content with other people and tools

it's not "syncing" yet but https://sharetheboard.com https://sharetheboard.com does make it easy to save and send whiteboard content with other people and tools (in real time). one-click integrations are a few weeks off. syncing is just one step after that.