For those who loved Half life 1 this is more than a mod is a complete remake of half-life 1. Nothing to do with half-life: source which was a fail this "game" pushes the source engine to its limit. Everything is being created from scratch. The mod started being planned in 2004 just after source engine came oout and is still in development. This week black mesa source facebook published a note saying that when 20k likes were achivied they would release new media. In 2 days the likes went from 7,5k to 25k.
https://www.facebook.com/BlackMesaDevs
I've been waiting for this mod since 2010 when i found it and since it is back to full speed i felt like sharing.
http://www.blackmesasource.com/