Concept: GIS software can be commercial (paid, proprietary licences) or open-source/free. The question asks which one is not commercial.
Step 1: MapInfo, ESRI (ArcGIS) and GIS Cloud are commercial products that require paid licences or subscriptions.
Step 2: Quantum GIS (QGIS) is a free and open-source GIS software developed by the community. It is not a commercial product, so it is the correct answer.
Answer: Option (2) — Quantum GIS.
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