Hiện nay

1. Object File System
2. Output Field Separator
3. Orbital Flight System
4. Operational Fixed Service
5. Orbiter Functional Simulator
6. Occasions for smoking scale
7. Officer Foundation System
8. Oligofructose - also OF
9. Open File System
10. Operational flight software
11. Office of the Foreign Secretary
12. One Finger Salute - also 1FS
13. Open File Server