Organisations
- Alliance Graphique Internationale, a group of graphic artists and designers
- Agenzia Giornalistica Italia, an Italian news agency
- Alan Guttmacher Institute, now simply the Guttmacher Institute
- American Gamelan Institute, an organization devoted to promoting and documenting the performing arts of Indonesia
- American Geological Institute, a federation of 45 geoscientific and professional associations
- American Graphics Institute, publisher
- Akademisches Gymnasium Innsbruck, Grammar school in Innsbruck, Austria
- Association for Geographic Information, UK organisation that includes Cadcorp among its members
- Analytical Graphics, a software company
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