QT is a framework to create native desktop GUIs and provides a web component based on chromium. This toolkit is used for several browsers in the Linux world (qutebrowser, Falkon, Angelfish, Konqueror) and by extension also for kiosk systems which display websites. Furthermore, many desktop applications embed it to show HTML content (think email clients, or embedded help pages in applications).

It would be great to add data for this such that consumers like browserslist can consume it. The mapping between chromium versions and QtWebEngine versions is listed on their website.