D&D The Tortle Package
Publisher: Wizards of the Coast
System: D&D fifth edition
Type: Accessory
https://store.steampowered.com/app/727080
D&D Curse of Strahd
Publisher: Wizards of the Coast
System: D&D fifth edition
Type: Adventure
https://store.steampowered.com/app/450080
D&D Eberron: Rising From The Last War
Publisher: Wizards of the Coast
System: D&D fifth edition
Type: Setting
https://store.steampowered.com/app/1163790
D&D Classics: C2 The Ghost Tower of Inverness
Publisher: Wizards of the Coast
System: D&D Classics - AD&D 1E/2E
Type: Adventure
https://store.steampowered.com/app/1086610
D&D Classics: FRQ1 Haunted Halls of Eveningstar (2E)
Publisher: Wizards of the Coast
System: D&D Classics - AD&D 1E/2E
Type: Adventure
https://store.steampowered.com/app/1119880
Pathfinder RPG - Bestiary 1 Pack
Publisher: Paizo Inc.
System: Pathfinder RPG and D&D 3.5/ OGL
Type: Core Rules
https://store.steampowered.com/app/597420
Pathfinder Campaign Setting: Sandpoint, Light of the Lost Coast
Publisher: Paizo Inc.
System: Pathfinder RPG and D&D 3.5/ OGL
Type: Setting
https://store.steampowered.com/app/1020460
Starfinder RPG - Alien Archive
Publisher: Paizo Inc.
System: Starfinder
Type: Core Rules
https://store.steampowered.com/app/790280
The Grand Grimoire of Cthulhu Mythos Magic
Publisher: Chaosium
System: Call of Cthulhu 7E
Type: Accessory
https://store.steampowered.com/app/766310