The PoDoFo library is a free, portable C++ library. It can parse and modify existing PDF files and create new ones from scratch. It also includes several tools to work with PDF files.
It features an unique approach which provides access to PDF documents via an object tree. Therefore, PDFs can be created and or manipulated using a simple tree structure.
Emma (Extensible Multi Media Architecture) is an open-source, modular, extensible, dynamic framework for declarative authoring and display of 2D and 3D interactive multimedia. It uses Lua for scripting and Ogre3D for rendering. http://www.emma3d.org
Screen (or SCalable REndering ENgine) is a rendering engine based on both 3D rendering and highlty parallel algorithms. It provides powerful scripting interfaces and integrated development environment for 3D games and scientific simulations.