National

• Anzac Centenary: the spirit lives 2014 – 2018
  Official Australian Government ANZAC Centenary site
• Australia War memorial
• About WW1  
• First World War Official Histories
  The Official History of Australia in the War of 1914–1918, the 12-volume series covering Australia’s involvement in the First World War (ed. by Charles Bean) is available online.
• WW1 @ the State Library of NSW
• National Library of Australia Flickr WW1 set  
• NSW ANZAC Centenary
  From NSW State Records
• Veterans NSW Centenary
• ABC News, ANZAC Day
• Gallipoli: the 1st Day
  An ABC 3D documentary site about the WW1 ANZAC landing at Gallipoli, on 25 April 1915

Indigenous Australians at War

• Indigenous Australians at War
  From AIATSIS Library, online collection about Indigenous Australian war service
• Indigenous Women and War
  From AIATSIS Library
• Indigenous Australians at War
• Too dark for the light horse
  From the Australian War Museum

International

• Discovering ANZACS
  From the National Archives of Australia and National Archive New Zealand
• Archive New Zealand
• Tweets from Gallipoli
• New Zealand First World War Centenary
• Imperial War Museum's First World War galleries
• First World War 1 Centenary
• Lives of the First World War
  You are encouraged to contribute to this site. Check their knowledge base to find out more.
• Europeana 1914-1918
  Europeana 1914-1918 brings together resources from three major European projects each dealing with different types of First World War material. The result is an archive that allows the national collections of libraries to sit beside personal stories and treasures and important film archives.
• The Commonwealth War Graves Commission (CWGC)
  Six member governments make up CWGC: Australia, Canada, India, New Zealand, South Africa and the United Kingdom