Palladium Books. It's the nostagalically important and referenced in the RPG section signfigantly.
BlackJack's Page is one of my favorite cyberpunk specific resources and GM advice places from all the way back. I may make a sub-tree of favorite parts.
The Basement of Warehouse 23. So many hours of dumb MacGuffins and ideas. Might as well take a look arount the makers of GURPS who made this web toy too
Drive Thru RPG a resource for older and smaller RPGs by PDF. Watermarked but DRM free. There are other sections on the site for wargaming and stuff, take a look around
This is where I was going to link One Page Rules for their Army Men Combat, Covering Fire!, DoubleTap and WarStuff and other actually One Page Games, but they've removed them. The Wayback links are dead because things were hosted on Google Drive. Maybe the names will help people find them.