Other
- Gesellschaft Deutscher Tierfotografen = Society of German Nature Photographers, organisers of one of the leading worldwide nature photography contest.
- Gas Discharge Tube, an electrical component with electrodes separated by a specific gas, tending to arc or breakdown at a specific voltage
- General Department of Taxation of Vietnam
- Global distance test, a metric used in protein structure prediction for judging the similarity of multiple protein structures with the same amino acid sequence
- Getting Things Done, an organizational method
- Grand dictionnaire terminologique, an online terminological database
- Ganvsig daighix tongiong pingimv (簡式台語通用拼音 "simplified Taiwanese Tongyong Pinyin"), a romanization system for Taiwanese Minnan
- Greenwich Daylight Savings Time, daylight saving time of GMT
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