Scout is a setting agnostic game (and system agnostic supplement!) where players collaboratively create an encounter map and craft the story of its features.
As a supplement, use Scout to run a low/no prep game and keep it in your back pocket for those times when you have painstakingly prepared, but somehow none of your lovingly crafted battle maps apply to the rabbit hole your players have gone down. Either way, Scout becomes a mini-game to whip up engaging maps for tactical encounters created with your players. Or entirely by them while you take a break to prepare objectives, foes, or finally get a snack!
Check out the Alternate Rules for optional variations for your favorite d20 system (like Pathfinder, Lancer, or Dungeons and Dragons), dice pool systems (like Shadowrun or Mutant Year Zero), Draw Steel, and Savage Worlds.
I am happy to be featured as a contributor on Beside the Lesser Travelled Road. It features 20 characterful and roleplay-prompting campsites. Each with a colourful description of the locale, details on what your characters will find if they forage or hunt there and key points of interest that will draw your characters attention.
Each has plot-hooks of three lengths, allowing you to choose between a 15-20 minute aside, a 45-60 minute scene or a 2-3 hour session!