God’s Acre is a set of free wargames rules for medieval battles. The rules were originally published in 1977 by Heritage Models.
Making and Using Silicon Molds
Here’s an instructive video on making and using simple silicon molds.
Legends of Time and Space
Legends of Time and Space is a free role playing game that takes its inspiration from Steve Jackson Games’ The Fantasy Trip.
Desert Mesa Modeling
How to make a Desert Mesa for your miniature wargames.
Car Wars Classic Free Rules
Steve Jackson Games has made the rules for the Classic Car Wars game free for the downloading.
I played the heck out of that game back in the day.