You mean KHMTL, born in KDE's Konqueror. That spawned WebKit (Safari), that spawned Blink (Chrome, Edge, Opera, etc). The whole thing then finally came full-circle when Konqueror dropped KHTML due to lack of development, now you have the choice between WebKit and Blink (via Qt WebEngine).
Then there's Gecko (Firefox) and Servo which had a near-death experience after Mozilla integrated half of it into Gecko but by now development is alive and kicking again. Oh and then there's lynx, using libwww, tracing its lineage back straight to Tim Berners Lee.