WolfenDoom: Blade of Agony

Definitely not GaaS, it even has its own Github repository.

Such a thrill of a game. So much challenge can be awakened.

Realm667 always has awesome Doom mods.

One of the best Doom mods ever. It may run like crap on my laptop at times but I enjoy every second playing it. Can’t wait for chapter 3

Played it. Arguably better than The New Order. Plays a lot like Return to Castle Wolfenstein. 

I'm was truly surprised at the sheer quality and attention to detail that this mod has. Like the dude above me said, this way better than the newer AAA Wolfensteins. Another excellent Doom mod to check out is Ashes 2063.