Our latest minor update includes the addition of the Qwant as a search option. Read more about our collaboration with the European search engine and get the latest version of Vivaldi below.Source: Vivaldi now includes Qwant, a search engine that respects your privacy | Vivaldi Browser
This bit caught my interest:
Most notably perhaps, is that Qwant is also the first European search engine that is building its own web indexing technology.I’m not familiar with Qwant but it is time for a one month test as a daily driver. Also I highly recommend Vivaldi as a browser.