Blender 2.70 is a free and open source 3D application. Here's how you can install it in Ubuntu 13.10.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo add-apt-repository ppa:irie/blender
sudo apt-get update
sudo apt-get install blender
Blender provides a broad spectrum of modeling, texturing, lighting, animation and video post-processing functionality in one package. Through its open architecture, Blender provides cross-platform interoperability, extensibility, an incredibly small footprint, and a tightly integrated workflow.More at Noobs Lab
Additional resources for Blender
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