If you don't know what it is. Blackmesa: Source is basically Half-Life 1 remade in the Half-life 2 source engine. It has been in the making since 2007. Because the dev team was made up of a group of 40 volunteers from valve.
Anyway I am extremely excited for this. And guess what? It comes out on FRIDAY September 14. It just got greenlit by steam and will be up on there. Even if you haven't played the original Half-Life, I highly recommend playing the remake one of the greatest campaign shooters in gaming history in my opinion.