Warband is a free RPG with a science fantasy, science fiction flavor. In truth, it could very well be the Warhammer 40K RPG. The author writes:
This game is my homage to the ‘grim, dark future’. A game of spikey power armor wearing, bolt-gun shooting, chain-sword waving chaos worshippers. Characters struggle to survive in the warp of space, as low-level members of a Chaos Lord’s warband, they strive to make a name for themselves and eventually captain a ship of their own.
Basic Fantasy is a free RPG system, complete with dozens of modules and supplements. The author writes:
The Basic Fantasy Role-Playing Game is a rules-light game system based on the d20 SRD v3.5, but heavily rewritten with inspiration from early role-playing game systems. It is intended for those who are fans of “oldschool” game mechanics. Basic Fantasy RPG is simple enough for children in perhaps second or third grade to play, yet still has enough depth for adults as well.
This is a major work.
Airbrushes are great for lots of things, but they also take lots of maintenance. Here’s a tutorial on how to clean your airbrush.
Captain Richard has a tutorial on modeling rusty metal.
Iron Ships and Wooden Heads are a set of free wargames rules for naval gaming “in the era of the big gun.”