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http://omniatlas.com/
Collection of maps compiled with the site's own style. Has enough detail to show points such as South Yemen's emirates or Chinese warlords.
http://www.emersonkent.com/maps.htm
Collection of maps from external sources, including quality ones from the US Military Academy Department of History and the 1912 Cambridge Modern History Atlas.
http://militera.lib.ru/
Military books, the vast majority of which are in Russian. A handful, however, are in English, such as Suvorov's Inside the Soviet Army and Fugate's Operation Barbarossa:
http://militera.lib.ru/research/suvorov12/index.html
http://militera.lib.ru/h/fugate/index.html
The first is an insider's thorough description of the Soviet Army, though he also writes about the ther branches. Suvorov discusses conscription (and draft dodging), training, the life of a soldier and an officer, military education, equipment, mobilization, deployment, organization and hierarchy, doctrine -including nuclear doctrine- and, most interestingly, the USSR's power structure, which he describes as a triumvirate between the Armed Forces, the Party and the intelligence service, and proves his point by narrating the post-Stalin power struggle as a battle between those three forces.
His style is easy to read and at times ironic (pic related). The site has another book of his on Soviet intelligence.
The second is a very assburgerish book on the Eastern front from planning stages to the Battle of Moscow. I found it while researching German invasion plans and haven't read much beyond the first chapter.