Tatlin is a Gcode and STL viewer heavily inspired by Mac-only software Pleasant3D. Besides viewing, it also supports rotating and scaling of STL files. It is currently in early stages of development, but should already be quite usable.
Tatlin requires the following packages:
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Python 2.6+
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PyGTK 2.24
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PyOpenGL
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Python bindings for GtkGLExt
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NumPy