Warthrone is a set of free wargames rules for fighting fantasy battles. You may find it an acceptable (or superior) replacement for Warhammer Fantasy Battles.
Miniatures Rules
Kings of War II
Mantic’s Kings of War, Second Edition is now available as a free download. There are also several free Army Books.
I can’t help but thinking that this game is the successor to Warhammer Fantasy, which Games Workshop has essentially abandoned.
Age of Sigmar Free Rules and Warscrolls
In a pretty interesting turn of events, Games Workshop now offers the rules and army lists for its fantasy miniatures game for free.
I actually see this as the final death throes of the game.
War of Princes American War of Independence Rules
War of Princes is a simple, one-page set of rules for the American Revolution.
Death To The Alien Scum
Death to the Alien Scum is a set of free wargames rules for 6mm miniatures.