Fight in rain soaked trenches or charge over No Man’s Land to battle in the War to End All Wars. Use authentic weaponry in your fight with the enemy, call in artillery strikes to take out foes en masse, and coordinate with your team to gain the final victory on some of the most infamous battlefields of The Great War. Screaming Steel: 1914-1918, previously known as WW1: Source is a total-conversion project being developed by devoted modders for the FPS game Day of Infamy.

ianthesoupdude says

10/10 - Agree Disagree

In a world with very few mod depicting the battlefield atmosphere of The Great War, this mod is a jewel. That said, scrutinizing some other aspects, it does not have many classes or weapons, or spectacular models.
The selection of maps are relatively many (well, knowing that almost all of the maps take place in the trenches its as varied as it can be), but it all depends on the servers you find, which, sad to say, there are not many. Of course, this is still in development, so some changes are expected.