Kings of War is a great free fantasy rules set from Mantic Games. Here’s a variant for the Viking Age
Space Fleet 2014 is a set of free wargames rules for fleet actions. It can be played on a hex grid or open tabletop, and there are rules for ship design, campaigns, sensors, and more.
Kings of War is a great fantasy rules set from Mantic Games. Here’s a variant for Rome’s Rise and Fall.
Here’s an extremely well done unofficial army book for halflings in Warhammer Fantasy.
Trierarch is a set of free wargames rules for naval warfare in the classical era. The game is based on DBA, with measurements expressed as “ship lengths.”