Ogre3D : OGRE has grown to become one of the most popular open-source graphics rendering engines, and has been used in a large number of production projects, i...
Open artist : a Linux Distribution for artists. Screenshots : https://www.dropbox.com/gallery/331020/1/openArtist?h=49f07b#gallery
OpenFrameworks : C++ library designed to assist the creative process by providing a simple and intuitive framework for experimentation.
MoviePy is a Python module for video editing, which can be used for basic operations (like cuts, concatenations, title insertions), video compositing (a.k.a. non-linear editing), video processing, or to create advanced effects. It can read and write the most common video formats, including GIF.