Lamentations of the Flame Princess is an old school RPG of “fantasy adventure and horror.” The link is to the free version without illustrations. The illustrated version apparently has some rather adult and disturbing illustrations.
fantasy
City Grounds Fantasy Skirmish
City Grounds is a fantasy skirmish game in the vein of Mordheim, but with different mechanics.
Fire At Will
Fire At Will is a set of free wargames rules for 6mm fantasy battles.
Nights of the Crusades RPG
Nights of the Crusades is an RPG that’s gotten lots of good reviews. The good news is that the pdf is free.
Shieldwall Fantasy Rules
Shieldwall is a set of free wagames rules for 6 – 8 figures, using a dice pool mechanism. It is short, but well done.