Whiteboard
From Faster Than 20
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Portable Whiteboards
Betabook. Foldable, notebook-sized whiteboards. You can hack something similar by buying whiteboard adhesive and sticking it on a clipboard. These look nice, though — like Moleskines.
Slickyboard. Form ad hoc whiteboards on walls using these static cling tiles.
Capturing Whiteboards
There are apps that help you deskew and enhance whiteboard photos. Rocketbook Beacons come out in April 2019 and supposedly simplify this process.