Known at the time as the Great War, or the World War, this conflict was not known as World War I until 1939, as there was not yet a second war and so no need to differentiate. The Great War began in July of 1914 and was waged until November 11, 1918. It involved every major nation in the world, lining up on two sides: The Allies and the Central Powers.
Regular Websites
The focus of this website is World War I, its causes and people. Discussions are about the battles and experiences of those who fought the war. - BBC: World War One
http://www.bbc.co.uk/history/worldwars/wwone/
Topics such as the assassination of the Archduke Ferdinand, the beginning of air warfare, Gallipoli, and America's entry into the war are found here. The Red Baron is also written about here. - Eye Witness to World War I
http://www.eyewitnesstohistory.com/w1frm.htm
Multimedia history contains background information, battlefield tours, battles, who's who, and a gallery of propaganda posters. Also displays diaries and memoirs of those who lived through the war and that era as well as poetry and stories of the time. - First World War
http://www.firstworldwar.com/
Fordham University: World War I
Examines the causes of war, the war itself, including diplomatic and military history, and personal accounts of those who fought in and witnessed the war. Also details the war resistance and literary responses. - Fordham University: World War I
http://www.fordham.edu/halsall/mod/modsbook38.asp
The World War I Document Archive
Presents an archive of primary documents from the Great War with treaties and official papers, diaries, personal reminiscences, and a section with images. - The World War I Document Archive
http://wwi.lib.byu.edu/