The first issue of Ares Magazine featured a game called “WorldKiller, The Game of Planetary Assault.” There’s also an interesting article on the “most significant science fiction and fantasy games” by (among others) Greg Costikyan. It’s a nice little piece of history and a glimpse to what was state of the art nearly forty years ago.
Here’s a set of color photos of Victorian Wales. There may be some use here for people making terrain.
Hordes of Dervishes is a set of free wargames rules for fighting battles in the Sudan. They’re based on the DBA system and are intended for 15mm figures.
This video has some really nice ideas for making cheap terrain for Star Wars Legion and other science fiction games.
Pro Patria! is a set of free wargames rules for game set in the Napoleonic era. There are accommodations for both 15mm and 25mm/28mm games