| Abbreviation | Definition |
|---|---|
| GXT | Ext GWT |
| GYM | Google Yahoo Microsoft |
| GZ | Gnu Zip |
| H | Header |
| HABTM | HasAndBelongsToMany |
| HACS | Hand Action Coding System |
| HAL | High Availability Linux |
| HALT | Harvard Atom Like Tool |
| HAMA | HTTP Anidb Metadata Agent |
| HAP | Homological Algebra Programming |
| HAPI | Helm Application Programming Interface |
| HAPI | HITRAN Application Programming Interface |
| HAPI | HL7 Application Programming Interface |
| HAS | Hospital Administration Software |
| HASEL | Human Aspects of Software Engineering Lab |
| HASL | High Assurance Software Laboratory |
| HASP | High Assurance Systems Programming |
| HASP | Houston Automatic Spooling Program |
| HAT | HOORA (Hierarchical Object-Oriented Requirements Analysis) Analysis Tool |
| HATE | Harness For Algorithm Testing And Evaluation |