For your modern skirmsih games — perhaps as a “Technical” — here’s a paper model of a Toyota Landcruiser. It’s too large as currently construed, but since its in GIF format, it would be very easy to resize.
Naginata Skirmish Rules
Naginata is a set of free wargames rules for samurai skirmishes.
WWI and WWII Naval Rules
Steve Burt offers a set of free wargames rules for WWI and WWII Naval combat.
The Last Human RPG
In this unusual free role playing game, you play a simple robot charged with defending the last human being. The Last Human is written by Nathan Russel as a part of the 24 Hour RPG Challenge.
Pencils and Powers Print-And-Play Game
Pencils and Powers is a print-and-play game that is billed as a “roll and write.” Basically, they’re on-page dungeons that are resolved through decisions and dice rolls. The link takes you to the inventor’s Facebook page. Click on the Play Game link to get to the files.