| Abbreviation | Definition |
|---|---|
| ACPC | Arab Collegiate Programming Contest |
| ACRD | Advanced Concept Restoration Device |
| ACRM | Alternative Csound Reference Manual |
| ACRP | Automated Contact Resistance Probe |
| ACS | Action Code Script |
| ACS | Adventure Creation System |
| ACS | Alma Common Software |
| ACS | Always Changing Something |
| ACS | Application Contents Service |
| ACS | ArsDigita Community System |
| ACS | Assert Collaborative Site |
| ACS | Autonomous Cooperative System |
| ACS | Church Software |
| ACSE | Adoption Centric Software Engineering |
| ACSE | Association Control Service Element |
| ACSLS | Automated Cartridge System Library Software |
| ACT | Application Control Table |
| ACT | Artemis Comparison Tool |
| ACTS | Alternative Computer Training Suite |
| ACTS | Automated Combinatorial Testing for Software |