On the Lamb Games have released a free copy of their new Brushfire Pirates rules to get public input into the game.
From their announcement:
Avast me hearties!
The first supplement for Brushfire is now available for public playtesting. Pirates adds the ability to field a full Pirate army in Brushfire, or add in some Mercs to your existing brushfire army. The PDF is available to download at Wargame Vault. As this is a playtest version there may be issues with spelling/grammar in the fluff and balance in the units. Please report any findings and opinions in the forums.