| Name | Version | Updated | Category |
|---|---|---|---|
| Omen | 2.52 | 01.04.1991 | Esotericism - Numerology |
| Oops | 01.01.1990 | Tetris | |
| Opt XX | 5.4 | 01.11.1990 | Modellbau |
| Ordne HDB | 3.69 | - | Disk tools |
| OSKAR | - | Basic - Omikron | |
| Osmochem | 1.0 | - | Science - Chemie |
| OSZ27 | 26.03.1993 | Science - Electronic | |
| Other Place | 1.2 | 20.04.1992 | Action - Arcade |
| Outer Limits | 01.01.1990 | Arcade - Missile Command | |
| Outguard | 1.1 | 01.01.1997 | Action - Shoot'em Up (3D) |
| P2SM (Pixels to Sprites & Masks) | 1.2I | 26.07.2025 | Sprite editor |
| Pac Mac | - | Pacman | |
| Pac-Manic | 0.8 | - | Pacman |
| Pacballs | - | Pacman | |
| Packy | 1.0 | 01.01.1997 | Pacman |
| Pacmania GEM | 1.0 | 12.01.2025 | Pacman |
| PADit | 1.11 | - | Font editor |
| PADM | 21.01.1989 | Database - Oldies | |
| Paint Box | 1.1 | - | Paint programs - Monochrome |
| Paint it | 1.0 | 01.01.1992 | Paint programs - Monochrome |
| Paintlux | 2.05 | 25.02.1988 | Paint programs - Monochrome |
| PaintShop Plus | 2.03 | 10.11.1992 | Paint programs - Monochrome |
| Pair Off | 01.01.1992 | Card games | |
| Palette | - | Utilities - General | |
| Paliver | 01.01.1989 | Puzzle game | |
| Pamphlet Light | 0.9 | 03.08.1991 | Printing - HP Deskjet |
| Pass auf | - | Anti virus | |
| Pasture | 1.0 | 01.01.1993 | Pascal - Utility |
| Pauk | 08.04.1988 | Languages - Vocabulary trainer | |
| PC-Picture Konverter | 1.74 | 01.05.1993 | Graphic converters |
| PD_Text | - | Word processor | |
| PD-Tris | 2.32 | 01.01.1993 | Tetris |
| Pegasus | 01.01.1987 | Paint programs - Monochrome | |
| Peking | 3.11 | 17.02.2004 | Mahjong Solitaire |
| Peking (Shisen-sho) | 1.5 | - | Shisen-sho (Mahjong 2D) |
| Periodic | - | Science - Chemie | |
| Perplexia - The Original Hybrid | 01.01.1990 | Puzzle game | |
| Peters Börsen-Manager | 1.1 | 01.01.1988 | Stock market |
| Petrax | 6.08 | 23.08.1987 | Paint programs - ST Low/High |
| pH-Wert | 1.02 | 20.07.1988 | Science - Chemie |
| Pic-Line | 1.0 | 02.11.1988 | Scanner |
| PIC2INL - Picture to Inline | 01.03.1993 | Basic - GFA - Tools | |
| Picture Artist | 1.0 | - | Paint programs - ST Low/High |
| Picture-to-PRG | 3.3.3 | 01.07.1993 | Viewer |
| Pie Bill Gates | 31.07.1999 | Action - Shoot'em Up | |
| Pigeon Post | 01.01.1992 | Reaction | |
| Pills II | 1.00 | 20.02.1991 | Pacman |
| Pills-Editor | 01.01.1988 | Editor | |
| Pinochle Four Handed / Double Deck | 01.01.1991 | Card games | |
| Piquet | 1.5 | - | Business simulation - Stock exchange |
GFA-Basic
GFA Basic was the most popular programming language dialect for the Atari ST. Developed by Frank Ostrowski and distributed by GFA Systemtechnik, GFA Basic quickly established itself with an ecosystem of tools, books, and libraries. The GFA Basic Editor is a modernized version with many new commands for multitasking systems.
