Mantic offers a free download of its Dreadball rules for science fiction sports / combat.
Fascinating stuff for history buffs ... which I assume most of my readers are ...
Vexillia has painting guides for the Thirty Years War in both pdf and epub formats.
Agent Decker is a spy-themed solo deckbuilding game.
The author writes:
AGENT DECKER is a mission-based deckbuilding game for one player where you'll acquire gear and skills by facing obstacles. The alarm raises every turn, so you must pick who you take out. Do you go for the cool weapon, or take out the security camera?
The download includes the print-ready cards and the rulebook for Agent Decker version 0001.
Macrocosm has a new line of science fiction miniatures -- and a free rules set. From their website:
Macrocosm is a 28mm Sci-Fi Skirmish game set in a future galaxy of excitement, rayguns, weird aliens and wonder.
Players take on the role of a group of adventurers and explorers, represented by a group of miniatures, where they play out scenarios and campaigns to determine the fate of the colonies and to further the glory of their chosen faction… and of course… to have fun!