| APACI |
Apache AutoConf-style Interface |
| APR |
Apache Portable Runtime |
| AXIS |
Apache eXtensible Interaction System |
| DACS |
Distributed Access Control System |
| FOP |
Formatting Object Processor |
| MPM |
Multi Processing Module |
| QSA |
Query String Append |
| VTL |
Velocity Template Language |