Mimi and Toutou Go Forth is a set of simple naval rules for WWI naval battles on Lake Tanganyika. Obscure, to be sure, but intriguing.
Roundwood’s World has some great photos of his WWI wooded terrain board.
Roundwood’s World has a nice post on how he modeled a marsh board for his WWI games.
No Man’s Land is a solitaire card game that’s supposed to simulate being a sniper in the Great War.
Roundwood’s World has an excellent photo illustrated post on how he built a trenches terrain board. It’s something I’ve always wanted to do.