Steam Workshop::Half Life 2 HD/Half Life Alyx addons.

Combine Elite red white addon - Half-Life 2 - ModDB

Steam Workshop::Half Life 2 Collection

Valve Is Reportedly Working on a Half-Life Game for Steam Deck

One thing I found about Gmod that is Interesting is the fact you can play the whole HL2 Campaign. : r/gmod

Half-Life: Alyx Workshop Tools - Valve Developer Community

Steam Workshop::HD & Enhanced HL2 Heads

Steam Workshop::Half Life 2: Combine Edition

Valve Has Officially Opened The Steam Workshop For Their VR Title Half-Life: Alyx

Steam Workshop::Half-Life 2 HD Pack

I've played Half-Life 2: Episode 1 in Gmod and it was really fun. : r/ HalfLife

PROJECT HL2 (MMOD) addon - ModDB

Civil Protection - Half Life Visual Rework at Ready or Not Nexus - Mods and community