Campbell Barton
bcda667d37
While in practice sys.modules has __main__ module, the purpose of PyC_MainModule_Backup/Restore is to temporarily override __main__. Running code outside of the text editor (callbacks for timers for e.g.) could remove the __main__ module which would then crash when running a script from the text editor.
Blender
Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing, motion tracking and video editing.
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Blender as a whole is licensed under the GNU General Public License, Version 3. Individual files may have a different, but compatible license.
See blender.org/about/license for details.