D&D Player's Handbook
Publisher: Wizards of the Coast
System: D&D fifth edition
Type: Accessory
https://store.steampowered.com/app/360090
D&D Tokens Volume 1
Publisher: Wizards of the Coast
System: D&D fifth edition
Type: Token Pack
https://store.steampowered.com/app/498890
Hellfrost Player's Guide
Publisher: Triple Ace Games
System: Savage Worlds
Type: Setting
https://store.steampowered.com/app/306530
Tome of Horrors Complete (Pathfinder Edition)
Publisher: Frog God Games
System: Pathfinder RPG and D&D 3.5/ OGL
Type: Accessory
https://store.steampowered.com/app/469530