Valve Making movies?

Valve Making movies?

As making games was not enough, Valve seems to have a great talent for making the video Meet the Pyro But at the end of the clip, it shows a logo of something I have never unheard off!
Its time to suss it out. I want to know what the hell is this 😀 more game engines should certainly have this to take advantage of in game assets, why not?
http://sourcefilmmaker.com/
I shall check it out once I have a moment 🙂