The Krigsspil site has a huge number of medieval and renaissance flags available for downloading.
16th Century
Flags For 14th, 15th and 16th Century European Armies
Vexillia has a selection of free flags for various European armies from the 14th, 15th and 16th centuries. These include 100 Years War, Wars of the Roses, as well as Spanish, Swiss, Landsnechts, Savoyed, Venetian and Imperialist.
Look in the right hand sidebar on the page for the links.
Early English Books Online
For people interested in original sources, the University of Michigan, the University of Oxford’s Bodleian Libraries and ProQuest have released some 25,000 texts dated from 1473 to 1700. Content is available in a variety of formats. Available immediately are some 25,000 books, with an additional 40,000 planned for the future.
Samurai Blades Board Game
Samurai Blades is one of a series of board games published in 1984 by Standard Games and by now long out of print. The game was essentially a skirmish game played on a hex board, with cardboard miniatures. Each character in the game was represented by several pieces, each depicting a different level of damage and injury. The web page at the link has lots of resources for the game, including the rules and gifs, tiffs, and jpgs of the pieces and boards. This is really useful if you have the game but have lost one of those aforementioned damage markers.
Hand Colored Photographs of Japan From 1865
Given the high levels of current interest in games set in Shogunate Japan, I thought people might be interested in these hand colored photographs of Japan from 1865. That’s several hundred years after the period in question, but I should think they would still be useful.