They are only three viable web-engines left over from the second browser-war:

  * Blink (Google): Used in everything, from Chrome, Edge, Opera, Qt-Toolkit, Electron.
  * Gecko (Mozilla): Firefox. And Waterfox? I assume Gecko is still hard to integrate.
  * WebKit and WebKitGtk (Apple and Gtk): Safari, Epiphany and Gtk-Toolkit. Easy to integrate. And the only engine where I’m aware that actually two side actively cooperate in development.

Epiphany is small and nice, but they need a lot more developers. And I think they should use ffmpeg, gstreamer seems to be a source of issues for many years. But again, they need us, every helper capable of C++ is welcome.

Ladybird an another new engine, implemented in C++. But it is in alpha-state, only for developers. Everyone else who tries to show us a new browser means “use that Google thing with another name on it”.