Here is a full list of all WW1 games until 2016. I took it from a study, so the info should be reliable.
List of Analysed World-War-I Games (58)
Flying (19)
Atari. (1980). Red Baron [Xbox 360]. Sunnyvale, CA: Atari.
BMB Compuscience. (1984). Sopwith [PC]. Milton: BMB Compuscience.
Cinemaware. (1990). Wings [Amiga]. Burlingame: Cinemaware.
Dynamix. (1997). Red Baron II [PC]. Fresno, CA: Sierra.
Dynamix. (1998). Red Baron 3D [PC]. Fresno, CA: Sierra.
Malibu Interactive. (1993). Blazing Skies [SNES]. Tokyo: Namco.
MicroProse. (1990). Knights of the Sky [Amiga]. Hunt Valley: MicroProse.
Namco. (1985). Sky Kid [NES]. Tokyo: Namco.
Neoqb, 777 Studios. (2009). Rise of Flight: The First Great Air War [PC]. Büren: Aerosoft.
Old Brown Dog Software. (2013). Wings: Over Flanders Fields [PC]. N.p.: Old Brown Dog Software.
Origin Systems. (1994). Wings of Glory [x86]. Redwood: Electronic Arts.
Rowan Software. (1996). Flying Corps [PC]. London: Empire Interactive.
Rowan Software. (1994). Dawn Patrol [Amiga]. London: Empire Interactive.
Silver Wish Games. (2004). Wings of War [Xbox]. Austin: Gathering of Developers.
Smart Bomb Interactive. (2010). Snoopy Flying Ace [Xbox 360]. Redmond: Microsoft Studios.
Smart Bomb Interactive. (2006). Snoopy vs. the Red Baron [PS2]. Shinagawa: Namco Bandai Games America.
subLOGIC. (1982). Microsoft Flight Simulator [PC]. Redmond: Microsoft Game Studios.
Synapse Software. (1983). Blue Max [Commodore 64]. Richmond: Synapse Software.
Third Wire Productions. (2006). First Eagles: The Great War 1918 [PS2]. London: G2 Games.
Naval (4)
Divide By Zero. (1996). Great Naval Battles V: Demise of the Dreadnoughts; 1914--18 [PC]. Mountain View: Strategic Simulations.
Rondomedia. (2007). 1914 Shells of Fury [PC]. Montreal: Strategy First.
Storm Eagle Studios. (2008). Jutland [PC]. Free Union: Storm Eagle Studios.
Turcan Research Systems Limited. (1992). Dreadnoughts [DOS]. N.p.:Turcan Research Systems Limited.
RTS (3)
GameTek. (1995). The War College: Universal Military Simulation 3 [DOS]. Davenport: Intergalactic Development.
Lesta Studio. (2008). Aggression: Reign Over Europe [PC]. Moscow: Buka Entertainment.
Lesta Studio. (2004). The Entente: Battlefields of World War I [PC]. Moscow: Buka Entertainment.
Grand Strategy (10)
Adanac Command Studies. (2007). Guns of August: 1914--1918 [PC]. Epsom: Matrix Games.
AGEOD. (2008). World War One [PC]. Gütersloh: Ascaron Entertainment.
BevelStone Production. (1995). Fields of Battle [PC]. Aarhus: BevelStone Production.
Darkest Hour Team. (2011). Darkest Hour: A Hearts of Iron Game [PC]. Stockholm: Paradox Interactive.
The Lordz Game Studio. (2012). Commander: The Great War [PC]. Luxembourg: The Lordz Game Studio.
Muzzy Lane. (2015). Making History: The Great War [PC]. Newsburyport: Muzzy Lane.
Paradox Development Studio. (2010). Victoria II [PC]. Stockholm: Paradox Interactive.
Paradox Interactive. (2006). Victoria: Revolutions [PC]. Stockholm: Paradox Interactive.
Paradox Interactive. (2005). Diplomacy [PC]. Stockholm: Paradox Interactive.
Paradox Development Studio. (2003). Victoria: Empire Under the Sun [PC]. Stockholm: Paradox Interactive.
Turn Based Strategy (4)
Blue Byte Software. (1992). History Line: 1914--1918 [Amiga]. Mountain View: Strategic Simulations.
Damon, R. (1994). Wargame Construction Set II: Tanks! [Amiga]. Mountain View: Strategic Simulations.
Frog City Software. (1996). Imperialism [PC]. Mountain View: Strategic Simulations.
Red Wasp Design. (2012). Call of Cthulhu: The Wasted Land [PC]. Bristol: Red Wasp Design.
FPS (9)
8monkey Labs. (2009). Darkest of Days [PC]. Cedar Falls: Phantom EFX.
Gallica Game Studio. (2013). The Trench: 1916 [PC]. Seine et Marne: Gallica Game Studio.
Kriegsgraben und Stormvogel. (2011). 1916: Der Unbekannte Krieg [PC]. Aalborg: Kriegsgraben und Stormvogel.
M2H and BlackMill Games. (2013). Verdun [PC]. Alkmaar: M2H and BlackMill Games.
Refraction Games. (1999). Codename Eagle [PC]. New York: Take-Two Interactive.
Starbreeze Studios. (2007). The Darkness [PC]. Novato: 2K Games.
The Farm 51. (2010). Necrovision: Lost Company [PC]. Austin: Aspyr Media.
The Farm 51. (2009). Necrovision [PC]. Austin: Aspyr Media.
TopHat Game Studios. (2012). The Somme: Lest We Forget [PC]. Cary: Epic Games.
Towerdefence/Castle Attack (3)
ConArtist. (2008). Warfare 1917 [PC]. Irvine: Armor Games.
Gameslab, BBC Scotland New Media. (n.d.). Trench Warfare. In BBC Schools (Ed.), Curriculum Bites World War One [PC]. Salford: BBC. Retrieved on March 29, 2014:
http://www.bbc.co.uk/schools/worldwarone/hq/trenchwarfare.shtml.
Signal Studios. (2012). Toy Soldiers [PC]. Redmond: Microsoft Game Studios.
Miscellaneous (6)
Bay 12 Games. (2004). WWI Medic [PC]. Silverdale: Bay 12 Games.
Infogrames Entertainment, SA. (2000). Hogs of War [PC]. Paris: Infogrames Entertainment, SA.
Porter, D. & Williams, H. (2014). Trench Mission. In The National Archives (Ed.), Trench Experience [PC]. London: The National Archives. Retrieved on March 29, 2014:
http://www.nationalarchives.gov.uk/education/greatwar/g3/game/.
Retro Army. (2013). Super Trench Attack [PC]. Edinburgh: Retro Army.
Smoking Cars Productions. (1997). The Last Express [PC]. Beverly Hills: Interplay Entertainment.
Ubisoft Montpellier. (2014). Valiant Hearts: The Great War [PC]. Montreuil: Ubisoft.