I previously worked at Intersection, an out-of-home (OOH) advertising company. Intersection does digital screens (displays and kiosks) in addition to traditional formats.

This is all public information that was previously shared, so it may be out of date: the devices are Linux (Ubuntu) [1], running an advertising player (Broadsign) [2], which has Chromium Embedded (CEF) for web content [3]. The kiosk app was written in React [4]. It does things like load most data ahead of time to provide that "instant" feeling [5].

[1] https://ubuntu.com/blog/digital-signage-the-face-of-the-smar...

[2] https://broadsign.com/blog/intersection-selects-broadsign-na...

[3] https://docs.broadsign.com/broadsign-ayuda/configuring-splas...

[4] https://mattj.io/posts/2019-02-12-building-smart-city-kiosks...

[5] https://mattj.io/posts/2019-07-09-improving-perceived-interf...