Other Uses
- Calamus (DTP), a desktop publishing application
- Calamus (poems), a series of poems by American writer Walt Whitman
- Calamus Ensemble, a classical music ensemble featuring Roberto Carnevale
- Ensemble Cálamus, a classical music ensemble featuring Eduardo Paniagua
- USS Calamus (AOG-5) a Mettawee-class gasoline tanker acquired by the U.S. Navy
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