VoidSW
VoidSW is the most relevant source port of Shadow Warrior, released as a public beta by Hendricks266 in the May of 2020.
NY00123's netcode improvements in particular were a major selling point that elevated VoidSW above other source ports, bringing WangBang in VoidSW from being outright unplayable to VoidSW being the best option available for multiplayer. Though despite all this it's still far from perfect, as there are numerous new issues and inconsistencies with original game.