D&D Monster Manual
Publisher: Wizards of the Coast
System: D&D fifth edition
Type: Accessory
https://store.steampowered.com/app/360115
D&D Princes of the Apocalypse
Publisher: Wizards of the Coast
System: D&D fifth edition
Type: Adventure
https://store.steampowered.com/app/382200
Fatal Experiments
Publisher: Chaosium
System: Call of Cthulhu
Type: Adventure
https://store.steampowered.com/app/415550
Call of Cthulhu 7E (Ruleset)
Publisher: Chaosium
System: Call of Cthulhu 7E
Type: Ruleset
https://store.steampowered.com/app/573470