| GAMELIST | Otelo (Amstrad Semanal) | 1985 |
| APPLICATIONS | Ostfriesenrechner (Schneider Aktiv Special)  | 1987 |
| GAMELIST | Osotos | 2024 |
| GAMELIST | Oscar in a Jam | 1985/1986 |
| GAMELIST | Orthustrad | 1985 |
| GAMELIST | Orthogus tome 4 | 1989 |
| GAMELIST | Orthogus tome 3 | 1989 |
| GAMELIST | Orthogus tome 2 | 1989 |
| GAMELIST | Orthogus tome 1 (CF1) | 1989 |
| GAMELIST | Orthographe: Ecrire sans fautes volume 2 | 198x |
| GAMELIST | Orthographe: Ecrire sans fautes volume 1 | 198x |
| GAMELIST | Orthocrack | 198x |
| GAMELIST | Orthochiffre (D.Cantillac) | 1988 |
| GAMELIST | Ortho-Repere
Repere Orthonorme | 1986 |
| GAMELIST | Ortho-Loup | 1988 |
| APPLICATIONS | Orpheus | 198x |
| GAMELIST | Orphée: Le voyage aux enfers | 1985 |
| GAMELIST | Ormuz | 1988 |
| GAMELIST | Orion (Star Division) | 1985 |
| SLIDESHOW | Orion (Digital Dream) | 199x |
| GAMELIST | Orion Prime | 2009 |
| GAMELIST | Orion | 19xx |
| CODING SRC'S | Origins (Computing With the Amstrad) | 1985 |
| APPLICATIONS | Orgue (Ludovic Debono) | 1986 |
| APPLICATIONS | Orgel-Champ (Compute Mit) | 1987 |
| APPLICATIONS | Orgel - Meister (CPC Amstrad International) | 1985 |
| APPLICATIONS | Organo Electronico | 1987 |
| APPLICATIONS | Organizacija | 1989 |
| APPLICATIONS | Organisateur de Fichiers Disquettes | 19xx |
| APPLICATIONS | Orgams | 2015/2016/2017/2018/... |
| GAMELIST | Ordipuz | 1987 |
| PAPERMAG | Ordimage | 1991/1992/1993/1995 |
| APPLICATIONS | Ordidactic | 198x |
| APPLICATIONS | Ordi Tiercé/OrdiTiercé | 1985 |
| GAMELIST | Orc's Dungeon (2ND @ CPCRETRODEV 2014) | 2014 |
| GAMELIST | Orc's Lair (The Amstrad Games Book) | 1984 |
| GAMELIST | Orbit Chicane | 1987 |
| GAMELIST | Orb Quest | 1990 |
| APPLICATIONS | Orakel (CPC Amstrad International) | 1987 |
| SLIDESHOW | Optix 3 | |
| APPLICATIONS | Optimizer (Computer Team) | 1985 |
| APPLICATIONS | Optimize ROM | 1990 |
| GAMELIST | OPQA vs. QAOP: The Final Battle (5th CPCRetroDev 2018) | 2018 |
| SLIDESHOW | Ophelie Winter Slideshow (Digital Dream) | 199x |
| GAMELIST | Opetrous | 1987 |
| GAMELIST | Operations a Trous (Jean Reingot) | 1988 |
| GAMELIST | Operation Wolf (version Magnum Lightphaser) | 1988 |
| GAMELIST | Operation Wolf: Plusedition | 20xx |
| GAMELIST | Operation Wolf | 1988 |
| GAMELIST | Operation Thunderbolt (GX4000) | 1990 |
| GAMELIST | Operation Thunderbolt | 1989 |
| GAMELIST | Operation Sertun | 1987 |
| GAMELIST | Operation Program Cleaner | 1991 |
| GAMELIST | Operation Omega | 1985/1987 |
| GAMELIST | Operation Hanoi | 1990 |
| GAMELIST | Operation Gunship | 1989 |
| GAMELIST | Operation Desert Storm | 1995 |
| APPLICATIONS | Operation Caretaker | 198x |
| GAMELIST | Operation Alexandra (1st CPCRetroDev 2018) | 2018 |
| APPLICATIONS | Operarateurs Logiques (CPC Infos) | 1990/1991 |
| GAMELIST | Open Tower Defense | 2021 |
| DEMOSCENE | Open Space (Vanity / 5th @ Revision 2022 4K Intro) | 2022 |
| DEMOSCENE | Onzieme sonate de MOZART (CPC Revue) | 1986 |
| DEMOSCENE | Only For You Eyes 2 | 1995 |
| DEMOSCENE | Only For You Eyes 1 | 1991/1992 |
| DEMOSCENE | Onescreen Colonies #4 (Vanity) | 2025 |
| DEMOSCENE | Onescreen Colonies #3 (Vanity) | 2023 |
| DEMOSCENE | Onescreen Colonies #2 (Vanity) | 2022 |
| DEMOSCENE | Onescreen Colonies #1 (4th @ Revision 2018 Oldskool demo) | 2018 |
| DEMOSCENE | Onescreen Colonies #0 (Vanity) | 2018 |
| GAMELIST | Onedin-Line | 1986/1987 |
| DEMOSCENE | One-line Irish Washer-woman (Amstrad Action) | 1991 |
| APPLICATIONS | One-line Entertainer | 1988 |
| GAMELIST | One Wonder (CPCRetroDev 2023) | 2023 |
| SLIDESHOW | One Page CPC (13th @ Amstrad Ascii 2021) | 2021 |
| GAMELIST | One Man and His Droid | 1985 |
| APPLICATIONS | One Dimensional Automata (Computing with the Amstrad) | 1987 |
| GAMELIST | One | 1986 |
| GAMELIST | Once a Knight is Enough | 1991 |
| DEMOSCENE | On-Screen Effects On the CPC464 (Popular Computing Weekly) | 1984 |
| GAMELIST | On the Run | 1985 |
| SLIDESHOW | On the Road (Forever 2008 Other Platform Graphics competition) | 2008 |
| LITTÉRATURE | On the Road to Artificial Intelligence | 1985 |
| GAMELIST | On the Oche | 1984 |
| APPLICATIONS | On File Database Management System | 2024 |
| GAMELIST | On Cue | 1987 |
| DEMOSCENE | Omicron Demo | 1990 |
| GAMELIST | Omeyad | 1989 |
| GAMELIST | Omeganea | 1986/1987 |
| APPLICATIONS | Omega Scroll (Amstrad Computer User) | 1991 |
| GAMELIST | Omega Planète Invisible
Omega der Geheime Planet | 1987 |
| GAMELIST | Omega Dimension
Dimension Omega | 1989 |
| SLIDESHOW | Omaha (Digital Dream) | 199x |
| SLIDESHOW | Omaha 2 Show | 199x |
| GAMELIST | Olympic Souris | 1987 |
| GAMELIST | Olympiad '86 | 1986 |
| GAMELIST | Olympe | 1985 |
| GAMELIST | Olli And Lissa 3: The Candlelight Adventure | 1989 |
| GAMELIST | Oliver Rand | 1985 |
| GAMELIST | Ole, Toro | 1985 |
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