Australia
Anzac Research, Anzacs: Officers died at Gallipoli, 1915, First AIF Order of Battle, The Diggers' War: Australia in the Great War , War's Cruel Scythe: the Health of Australian
Austria-Hungary
Austro-Hungarian Land Forces 1914-1918, Isonzo Front, Solving Problems Through Force
Belgium
Belgian Fronts, Belgian War Graves, Brave Little Belgium - the history of the Belgian , German Policy in Occupied Belgium, 1914-1918, Refugees in The Netherlands during the First World, The Belgian Army, 1914, Through the Iron Bars
Canada
21st Battalion CEF 1914-18, Banff National Park - World War I Internment Camps, Canada and the First World War, Canadian Air Aces and Heroes, Central Ontario Branch of the Western Front Associ, For King and Empire: Canadian Soldiers in the Grea, Internment of Ukrainians in Canada 1914-1920, Newfoundland and the Great War, Soldiers of the First World War - Canadian Expedit, The Canadian Great War Homepage
Germany
A Pocket German Army, Germany during World War One, Germany's Use of Chemical Warfare in the Grea, Koeniglich Preussische Jagdstaffel 2 "Boelcke, The Prussian Machine, Tirpitz and the Rise of the German Navy, U-Boat War
United Kingdom
241 Brigade Royal Field Artillery, 6th Batt. Tank Corps WWI History, 8th Battalion City of London Regiment Post Office , British Armoured Forces in the First World War, Executed For Example, Far from the Front, Hellfire Corner: The Great War 1914 - 1918, Hythe in the First World War, Kitcheners Men, Market Harborough in the First World War
United States
15th Field Artillery Regiment in World War 1, 20th Engineer Regiment, A Bit Of History: on board the USS Mallory 1918-19, Doughboys!: The American Soldier in World War I, Missourians in the First World War, Secrecy in World War I, Sow the Seeds of Victory!, The American Indian in the Great War: Real and Ima, The Doughboy Center, The Nation's Forum
Anzacs
The story of the thousands of Australians and New Zealanders who fought in the First World War as part of the Australia and New Zealand Army Corps (ANZACs). Extensive site with many illustrations and animated poems.
Submarines of the Great War
Information on British submarines in the First World War, focusing on J-Class Submarines and the Zeebrugge Raid of 1917.
The Minor Powers of the First World War
Focuses on the more obscure participants in the war, such as Bulgaria, Greece, Japan and Portugal.