Here is a list of all the games i have found so far that was originally flat-screen but is now VR, I will add links to guides and installation instructions of each games over time.
Full Support (headset and Controllers)
7 days to die
Bendy and the ink machine
Black Mesa
Deep Rock Galactic
Doom 3 (Quest)
Far cry 1Firewatch
GTFO
Gary’s Mod
Gunfire reborn
Half-Life 2
Half-life (PCVR)
Half-life (Quest 2)
Jedi Academy (PCVR)
Jedi Academy (Quest)
Jedi Outcast (PCVR)
Jedi Outcast (Quest)
Left 4 dead 2Life is Strange: Before the stormMorrowindOuter Wilds
Portal 2Quake 3 Arena (Quest)
Raft vrResident Evil 2
Resident Evil 3
Resident Evil 7
Resident Evil 8
Return to Castle Wolfenstein (Quest)
Risk of rain 2
SubnauticaUltrakill
ValheimVivecraft
Saints row 3
Rank A Mods
Alien isolation
No one lives Forever 2
Pray for the Gods VR
Mech warrior 5
Subnautica Below 0
Devil may cry 5
Monster Hunter Rise
Rank B Mods
Wolfenstein 2 The new Colossus
GTA 5
Rank C Mods
Elden Ring VR
Horizon 0 dawn
Cyberpunk 2077
Atomic Heart
Uncharted 4
Hogwart's Legacy
Final Fantasy VII
Marvel's Spider-Man