Ziteboard is a virtual online whiteboard with team collaboration. The boards can be used in realtime synced more or in asynchronous mode. The whiteboard can be access by its permanent, unique link https://ziteboard.com
Ziteboard is a lightweight whiteboard website which works on any device: laptops, tablets, mobile devices – optimized for both iPad's Safari and Google Chrome on laptops.
The pro features are 9 custom colors, high resolution image insertion. You can import PDF page by page or the whole PDF using the end operator.
You can export the boards in many formats and manners. The simplest is the PNG export, where the visible screen is exported. The SVG export gives you vector graphic export of the whole board. The PDF export exports the A4 pages of the infinite working space. If you want to store the whiteboard on your local machine instead of the cloud, export the board as backup file. You can also publish the whiteboard in view only mode, a published board can be view with Ziteboard's viewer. Check more features at https://ziteboard.com/online-whiteboard-features/
The whiteboard can be customized as well. If you have any feedback just post to trello https://trello.com/b/XSOt2vUo/free-virtual-collaborative-whiteboard feedback board maintained by trello/whiteboarding: https://trello.com/whiteboarding