Agora is a free print-and-play tile laying game from Cheapass Games.
Are you old enough to remember the DwarfStar board games? If so, then you probably have the same fond memories as I do. One of my favorites was Goblin. In it, players take turns pillaging and plundering a hapless valley.
GMT Games offers a free download of a Battle of Agincourt game. If you’re familiar with their commercial board war games, you’ll know that they have wonderful graphics and gameplay, both of which are on display here.
Yashima is a print-and-play combat game that combines “the speed and complexity of card games with the tactical movement and terrain found in miniatures game.”
Afternova is a free print-and-play game about collecting resources from a solar system after it has been destroyed by a supernova.