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Geany

GemStone/S

Geospatial content management system

GeoJSON

GeoServer

GeoTIFF

Gephi

GetFEM++

Ginger Software

GlassFish

GNU Chess

GNU Mailman

GNU Savannah

GNU Taler

GNU toolchain

Google Lighthouse

Google Wave

Google Pinyin

GOS (operating system)

GPUGRID.net

GRASS GIS

Greasemonkey

Grep

GTUBE

Gunicorn