I guess I've just always been a little surprised that studios didn't open source more of their internal software. For example, Nuke was originally internal software at Digital Domain before they sold it to The Foundry, I believe. Rhythm & Hues also has a lot of its own internal compositing and 3D applications. And Pixar's Renderman software is also not open source (I know some aspects of Renderman are open source, but the actual Pixar Renderman software is not open source). It just surprises me that more of these internal applications didn't get open sourced. Blender is a good example of one that did. While I'm sure these studios were getting an edge by having their own software in the early days of cg, now I would think the studios would actually benefit more by open sourcing their apps so that other developers can contribute to the project. And the studios that make this software might be able to cut back on their dev teams. Just something I've always wondered about.