(see individual countries as well)
Commonwealth War Graves Commission, burial database, etc.: http://www.cwgc.org
World War I Cemeteries, photographs, etc. Terry Heard and Brent Whittam: http://ww1cemeteries.com
:
POW Research Network Japan, POW研究会, Prisoners of War – Japan – World War II, lists of camps, ships and of Allied prisoners of war who died in Japan: http://www.powresearch.jp/en/index.html
CANADA
Canada’s Naval Memorial, obituaries. See also the Action Stations! magazine: http://hmcssackville.ca/
USA
Military Personnel Records, USA: https://www.archives.gov/st-louis/military-personnel/
U. S. Army Heritage & Education Center: http://www.carlisle.army.mil/ahec/index.cfm