The technology behind Half-Life, known as GoldSrc, is a modified version of the Quake engine, and remnants of Quake code are present in Valve's Source 2. A modder named KleskBY is developing a project called Libre-life, which aims to port elements from Half-Life into Quake source ports, particularly focusing on the Zircon Engine. KleskBY believes that older engines like GoldSrc have limitations that hinder creativity and prefers using Quake source ports over Xash3D, arguing that they offer capabilities that Xash does not. Libre-life is in early development, with progress including the reimplementation of all weapons from Half-Life 1. KleskBY uses AI extensively in the project, despite expressing strong negative opinions about AI's broader implications.