The EP main book and the Bundle of Holding EP pack (which included the Devotees!)
MAOCT (and also may have influenced my choice of prize for winning the fan contest)
COC
Little Fears
Slasher Flick
The Laundry Bundle of Holding (mostly because of their discussion of how much they like the novels. Maybe some day we'll see the game.)
No Security and gameless Lover in the Ice
and now, with an Old Guard pledge, all Delta Green everything, both old and new.
If it wasn't for my friend introducing me to AD&D, I won't be into RPGs, and if it wasn't for RPPR, I wouldn't be playing all this stuff. I've read through MAOCT, Little Fears, Slasher Flick, and No Security / Lover, got most of the way through EP, and part of the way through COC.
Non RPGS:
Horrorstor (Lovely concept and execution, plus Cleveland represent! In violent horror!)
Fordlandia
Tinseltown
Payday 2
This Book is Full of Spiders
The RPPR Patreon
The Drunk and the Ugly Patreon