ShadowAssassin
Explorer
Seventeen not counting multiples of the same rules used for/in different games.
GUMSHOE - Ashen Stars
Tekumel, Empire of the Petal Throne - EPT
World War Cthulhu - Cold War
GUMSHOE - Poison Tree playtest
GUMSHOE - Night's Black Agents
OSR - Zur
PbtA - Blades
PbtA - Sprawl
PbtA - Impulse Drive
DCC - Lankhmar
Empire of YS/Through Dread Portals
Crypts and Things
Wordplay 2.0
Petal Hack
Invictus
Mythras Mythic Rome
Barbarians of Lemuria
DCC
Call of Cthulhu
The Sprawl
Laundry
GUMSHOE - Ashen Stars
Tekumel, Empire of the Petal Throne - EPT
World War Cthulhu - Cold War
GUMSHOE - Poison Tree playtest
GUMSHOE - Night's Black Agents
OSR - Zur
PbtA - Blades
PbtA - Sprawl
PbtA - Impulse Drive
DCC - Lankhmar
Empire of YS/Through Dread Portals
Crypts and Things
Wordplay 2.0
Petal Hack
Invictus
Mythras Mythic Rome
Barbarians of Lemuria
DCC
Call of Cthulhu
The Sprawl
Laundry