The Junior General offers rules and figures for the classic Battle of Zama.
Rules Link
Wargame Figures Link
The Junior General offers a set of free wargames rules — along with figures — for The Battle of Adrianople from 378 AD. Historically, things did not go well for the Romans against the Visigoths.
Schlachtfield is less a set of free wargames rules than a series of thoughts about ancients wargames. It is interesting nonetheless.