Terminus was a modification that seeked to recreate the original 2002 look of Half-Life 2.

This is mod's dev build Circa 2015, right when development stopped. Requires SDK base 2013 and EP2/EP1 installed.  Also includes original map sources, model sources, and some texture sources.  Be sure to check out some of the VMF's, as not all of them are precompiled.

Terminus' Source Code
ModDB page