Meshroom is a simple to use one-click open source photogrammetry solution which allows you to explore the process of 3D scanning in-depth if you want to. We talked to the Meshroom developer team during FMX.
François Beaune is the project founder and team leader of Appleseed, which is a render engine that is completely open source like Cycles or Luxrender. Appleseed is MIT-Licensed, which is probably the most liberal license in existance. It is availabe for Maya, Blender, Gaffer and other programs.