Here is a clever gadget that lets you use any screen into a digital whiteboard for collaboration with your team. GoTouch lets you connect your phone, tablet, or computer and invite others to collaborate with you on their own devices. You get to write over PDFs, change pen type/thickness/color, and do other simple tasks on your digital whiteboard.
The GoTouch camera and pen are small enough to fit in your bag or pocket. The system runs on battery and connects over Bluetooth, so you won’t have to deal with too many wires.[where to find it]