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I don'r know if this counts but there is also https://www.qutebrowser.org/ which uses qt webkit IIUC

qutebrowser doesn't really use webkit anymore. It was an alternative browser engine, but even the developers say that it isn't recommended.

It now uses the QtWebEngine, which is chromium based:

QtWebKit is not recommended but it is still available if you want it: https://qutebrowser.org/doc/help/settings.html#backend. There is a ticket to remove it completely which is now targeted for V4 (https://github.com/qutebrowser/qutebrowser/issues/4039) but, in reality, you could still use it.