Sketchup
		
		
		
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SketchUp is a 3D modelling program for a broad range of applications such as architectural, civil, mechanical, film as well as video game design — and available in free as well as 'professional' versions.
OSE Case
While Sketchup is not open source - meaning - one cannot simply take the source code and make improvements or add features as needed - it is free and widely accessible around the world. The wide accessibility allows wide-scale collaboration to happen. The problem that OSE had in the past was that