• Blackmoor Campaign (First Fantasy Campaign, Adventures in Fantasy, Dragons at Dawn, Champions of Zed, The Book of Elder Magic, Lost Dungeons of Tonisborg)
• 0e D&D Chainmail
• Warlock (The Spartan #9 and #10)
• The Complete Warlock (3 zines)
• Holmes Basic D&D
• AD&D 1e
• B/X D&D
• Red Box Basic D&D
• Black Box D&D
• D&D 5e (various core books)
• Mazes (all zines)
• The Very Good Dogs of Chernobyl
• Savage Sisters
• Rebel Scum
• Astonishing Swordsmen and Sorcerers of Hyperborea 1e
• Adventures in the Eastmark
• Swords & Wizardry Complete box set
• Dark Places and Demogorgons
• Starship Infernum
• Alien RPG
• The One Ring
• The Dark Eye
• Blades in the Dark
• Ryuutama
• Never Going Home
• Monster of the Week
• Delving Deeper Rules Compendium
• Savage Worlds Adventure Edition
• Agon
• Action Potential
• Basic Fantasy 3e
• Goblin Slayer TRPG
• Dungeon Crawl Classics

↑ Basically, if you could strip rules, mechanics, and content from any of those games to graft onto your own homebrew campaigns, what would you shamelessly steal? What are the coolest features of these games? Which game should I try to get my gaming group to play aside from D&D 5e?

Thanks everybody for your input!