[Karellen]

I had a quick look and it appears that the Linux backend is GTK-3 based? (Requires gtk-3-dev to build.)

Pity. For a moment I was briefly excited that someone had created a Rust binding for EFL/Enlightenment (aka "E").

[bri3d]

No, egui is an immediate mode framework which draws its own widgets completely using EGL.

GTK is only required if you want the GTK WebView, iirc.