In Sweden our education department decided to use a regular website, so we have only created a simple website kiosk. Is just as locked down as a testing kiosk, and all responsibility for all features is solely on their door step.
But, we have also been using a kiosk app for other testing, called Trelson.
They will have to figure something out before end of next year. Else they will lose many customers.
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https://wheretofind.me/@NoSubstitute