The amazing Perfect Captain has released a new set of campaign and miniatures rules for the Wars of the Roses: A Crown of Paper. It’s all free, but the quality of the rules and components of the Perfect Captain’s stuff easily matches or surpasses those of commercial sets.
Miniatures Rules
Last Stand – The First Battle of Thermopylae (480 BC) Rules and Figures
Last Stand – The First Battle of Thermopylae (480 BC) is a set of free wargames rules and figures for the classic last stand of the Spartans against the Persians.
Free Move Timed Move Ancients Rules
Free Move Timed Move is a set of Ancients rules based on the Morschauser Roster System.
Merlin Rouge
Merlin Rouge is a fantasy supplement for the You Are Still My Lord Wars of the Roses rules. Both rules sets at the link.
Panzer Gruppe WWII Rules
Panzer Gruppe is a set of free wargames rules for corps/army sized battles in World War II.