Ungentlemanly Warfare: A Baker’s Dozen of Booby Traps (Army Men), 100 Things to Find in Caves (5E) and 100 Belare for Esper Genesis are now available to buy from DriveThruRPG.
Booby traps are a common part of role playing games and warfare, and Ungentlemanly Warfare: A Baker’s Dozen of Booby Traps (Army Men) has 13 such for Army Men.
Caves can have interesting features, and 100 Things to Find in Caves (5E) has 100 such, ranging from intelligent to animal to natural. They can be used as background colour or items of interest. This is a conversion of the original supplement to 5th Edition. You do not need all versions.
100 Belare for Esper Genesis has 100 belare for characters to encounter. Each is named and briefly has its main interest described. They can be used as friends, foes or simply passers-by.