| Program | Role | Version | Date |
|---|---|---|---|
| Formula Pro | Programmer | 2.0 | 1995-01-01 |
| Masterlife/LIFE | Programmer | 1987-12-01 | |
| Artus (Database) | Programmer | 0.0 | |
| Disksort | Programmer | 0.2 | |
| Harddisk Utility III | Programmer | ||
| Headline | Programmer | ||
| Kalah (Christen) | Programmer | ||
| MEMO (Christen) | Programmer | ||
| Scarabus | Programmer | 3 | |
| Script | Programmer | 5 | |
| Solitaire (Christen) | Programmer | ||
| Turing-Simulator (Christen) | Programmer |
