The digital collection Prisoners of the First World War has been created by the International Committee of the Red Cross (ICRC). This collection contains digitized archival records about some 10 million prisoners of war during the First World War, mainly in Europe, but also in Russia, the Near East, India and Japan. The belligerent countries sent lists of prisoners to the ICRC. These lists were organized in alphabetical indexes which have been digitized for this project. You can search here individual persons, but also look at information about the internment camps, in particular from official inspection reports, browse postcards of the ICRC concerning the camps, and read letters about prisoners sent to the ICRC. Among the examples of information about prisoners is the archival record for captain Charles de Gaulle. The collection is accessible in English and French.
The digital collection Topical Sketches by Douglas G. Ward has been created as a part of the Digital Collections of the University of South Carolina Libraries. With six other digital collection it belongs to the Joseph M. Bruccoli Great War Collection. These collections are listed also at the South Carolina Digital Library. Corporal Douglas G. Ward served with the South Staffordshire Regiment. He took part in the landings at Gallipoli in 1915. In 1916 he served at the Somme. He got wounded and was transferred to India. His sketchbook made in ink and pen and watercolour contains 65 drawings on many subjects, for example his training at an infantry camp, A number of drawings are clearly cartoons.There are some brief notices, too. You can browse the entire sketchbook and use thumbnail images to accelerate browsing.
The website of the Commonwealth War Graves Commission (CWGC) has been developed to provide an online database for soldiers from all countries belonging either to the former British Empire or to the British Commonwealth who were killed during action in 153 countries around the world, and to search for particular cemeteries. You can find information about 1,700,000 people and some 23,000 cemeteries. The website has a section with articles about some of the battlegrounds of the First World War. The CWGC was founded in 1917. There is a page with information about similar organisations in several countries and their websites.
The website King-Emperor: The Indian Army on campaign 1900-1939 is maintained by Christopher Trevelyan. He documents the history of the Indian Army in action with a series of articles on several units of the Indian Army, numerous photographs and information about campaign medals. The website has an extensive selection of web links.