In order of most games played:
D&D 5e
Dungeon World
D&D 4e
Savage Rifts
Call of Cthulhu
City of Mists
Monster of Week
Savage Worlds Fantasy
WHFRPG 4e
Labyrinth Lord
Numenera
Forbidden Lands
FATE
PF 1e
AD&D2e
PF2e
Traveller (Classic)
Paranoia (XP)
M-Space
Mythras
Call of Cthulhu
These are my top five, I played some OSR B/X games, Traveller T5 & Cepheus Engine/mongoose 1e; except for short duration or not memorable. There are others in there too.