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octaNe
( Endzeit Memento Mori [HP] Jared A. Sorensen )
ODES ( Universell Lewis Jardine )
Odysseus ( Historisch Fantasy Games Unlimited [HP] OOP Marshall T. Rose )
Odyssey ( TSR * [HP] OOP )
Oem Prime ( Fantasy Omnimarcus [HP] )
Of Gods and Men ( Fantasy Non-Sequitur Productions [HP] )
Official Superhero Adventure Game ( Superhelden Mayfair Games (vormals Eigenverlag) [HP] OOP Brian Phillips )
Og ( Historisch Wingnut Games [HP] )
Og ( Historisch (Humor) Wingnut Games [HP] OOP )
Ogre Miniatures ( SciFi (Mecha) Steve Jackson Games [HP] )
Okahoshin ( Fantasy )
Oko Yrrhedesa ( Fantasy Andrzej Sapkowski )
Old West ( Historisch (Western) )
Olendiak
( Fantasy Ashrik & Calypso ThunderCrest. Jason Coplen¸ Marlene Jenkins-Haraguchi¸ & John Leutz )
Ombres de la Lune
( Fantasy [HP] David Teller and Boris Bret )
Omega
( SciFi (Fantasy) TSR * [HP] Klaus Mogensen )
Omnigon ( SciFi (Space Opera) Omnigon Games [HP] OOP )
On Stage ( Historisch DaS Production [HP] L. Giuliano )
Once Upon a Time in the West ( Historisch Tabletop Games * [HP] )
One Brain Cell
( Universell Canis Publishing [HP] Canis Publishing )
One Piece
( Fantasy )
Oniros ( Fantasy Multisim [HP] )
Online Rollenspiel ( Fantasy )
Open
( Universell )
Open Form
( Universell Stoned Gorilla Project * [HP] Nuerodragon and The Frost Siva )
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OPES ( Universell Laurence Withers )
OPIGS
( Superhelden One Page Gaming System [HP] David Mar )
Opus Anima
( Horror NewQuest Verlag [HP] )
Oraculo ( Historisch Joc International [HP] )
Orbis Incognita
( Fantasy Orbis Incognita [HP] Niels Bengner¸ Florian Jysch¸ Lennart Hintz¸ Markus Homeister¸ Aleksander Zgraja )
Orbit ( SciFi (Space Opera) 6-0 Games [HP] Jeff Diamond )
Order of St Talis ( Fantasy )
Oregon Trail ( Fantasy )
Oriental Adventures ( Fantasy TSR * [HP] OOP )
Oriental Adventures d20 ( Fantasy Wizards of the Coast [HP] )
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Ork-LUltime Outrage
( Fantasy Ghislain Morel )
Orkworld ( Fantasy Wicked Press [HP] John Wick )
Oroborus
( Crossgenre Ragnarok Press [HP] David F. Nalle (Ragnarok Press) )
Orpheus ( - )
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Osprey
( Universell [HP] Christopher A. Goodwin with Ron Hale-Evans and Marty Hale-Evans )
Ostfriesland Rsp
( Humor [HP] Uke Bosse [Mail] )
Other Suns
( SciFi (Space Opera) Fantasy Games Unlimited / Rävsvans Förlag [HP] OOP Niall C. Shapero )
Otherland ( Fantasy )
OtherSpace
( SciFi (Space) [HP] Wes Platt )
Oubliees ( Fantasy Delcourt [HP] )
Outime ( Crossgenre Valhalla Simulation Games [HP] OOP )
Outlands ( SciFi Discordia Inc. [HP] )
Outlaw ( Historisch Hero Games [HP] OOP )
Outlaws of the Water Margin
( Fantasy (China) Panurge Publishing [HP] Paul Mason )
Outtime ( Zeitreisen Valhalla Simulation Games [HP] OOP Marc W.D. Tyrell )
Outwards ( SciFi (Hard) Impossible Scenarios Group [HP] )
Outworlders
( SciFi Tre Chipman )
Over the Edge ( Mystery Atlas Games [HP] Jonathan Tweet with Robin D. Laws )
Oversized Heavy Mechanized Units ( SciFi (Mecha) Jonathan Tweet )
OVNI soit qui mal y pense ( Fantasy )