Well, for my experience, this happens a lot more than the desired. I am the project administrator of a Open Source RenderMan compliant renderer. When I announced the development and upcoming release of my rendering system, the project administrator of another RenderMan compliant start complaining with it. Frequent questions in several forums ( and to my e-mail )was: " Why another OpenSource renderman? "; " Isnt the aim of Open Source avoid double efforts? "; and that sort of things. Hell, Open source does not restrict you in any way. You are free to think, why you shouldnt be free to develop your own project, with the characteristics that you want? The point of this reply is only to say that unfortunatelly there are a handfull of so-caled " Open Source Developers " that are only in this because they believe that is very cool to feature a Open Source banner in their websites.