- Occult Adventure (1993) (David Munden) (PD)
- Oh No More Lemmings - Data Before Compression (19xx) (Chris White)
- Oh No More Lemmings - GFX IFF (19xx) (Chris White)
- Oh No More Lemmings - Make Files (19xx) (Chris White)
- Oh No More Lemmings - Make Master Side 1&2 (19xx) (Chris White)
- Oh No More Lemmings - Raw Data IFFs (19xx) (Chris White)
- Open 3D V082 (2001) (Tobermory)
- Ore Warz II (1990) (William McGugan)
- Outlet - Sam & Spectrum Mag Issue 33 (May 1990)
- Outlet - Sam & Spectrum Mag Issue 56 (April 1992)
- Outwrite V2 (1992) (Rj Will Kinson)
- Outwrite V2.0 (1992) (Chezron Software)

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