Zig Forums has always been known for it's in depth browser threads, but how often do we really look under the hood and discuss the rendering engines that run these browsers and do most of the actual heavy lifting of displaying a webpage? Right now there are three main browser engines:
Webkit: Made by apple. Written in OOPC. Used by Safari. Has official Gtk+ binding for ease of use by pajeets. as easy as gtk+ can be, anyway. Also has external projects making bindings in many other languages.
Blink: Made by google. Originally forked from webkit. Written in C++. Used by Google Chrome. As far as I am aware, there are no bindings for it. If you want to roll your own browser with it, you better know what you're doing.
Gecko: Made by Mozilla. Infected with Rust. Used by Firefox. It used to be good before Mozilla went full retard. Like blink, there are no bindings for Gecko.
Other engines of note:
Goanna: Forked from Gecko. Used by Palemoon. Like Gecko used to be before Quantum and the webextensions bullshit.
Servo: Mozilla's experimental engine. Extremely infected with Rust.