Blender
		
		
		
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Blender is an open source (free) 3D Modeling package that can be used to create static props. Although XSI is the Valve-recommended program for modelling, many will find Blender to have an easier learning curve. The free version of XSI for Source modeling has some limitations and watermarks images.
See also
Blender 3D: Noob to Pro wiki [1]