The OpenSceneGraph is an open source high performance 3D graphics toolkit, used by application developers in fields such as visual simulation, games, virtual reality, scientific visualization and modelling.
MeshLab is an open source, portable, and extensible system for the processing and editing of unstructured 3D triangular meshes. The system is aimed to help the processing of the typical not-so-small unstructured models arising in 3D scanning, providing a set of tools for editing, cleaning, healing, inspecting, rendering and converting this kind of meshes.
TG-Gallium3D is a hardware- and API- neutral intermediate format that will allow Tungsten Graphics to efficiently build graphics drivers to support a variety of hardware platforms for modern 3D APIs on various OS environments.
Indigo is a free, actively developed, physically-based unbiased render engine.
Employing advanced features such as Metropolis Light Transport, Spectral light calculus, a virtual camera model, physical sky and more, Indigo can achieve much more realistic results than traditional GI raytracers.
Indigo does not need any render parameters like GI samples, AO samples, AA samples, Soft shadows, etc, and complicated lightning setups to achieve realistic results.
Indigo is free for non- and commercial use, but as of writing is not open-source.
Espresso3D is a high performance real-time 3D engine for the Java(tm) programming language. E3D is not just a scene graph. It aims to be a complete solution for your application with OpenGL rendering, OpenAL audio, collision detection, input, and rendering support.
Espresso3D began as a free for non-commercial use library in October 2004. As of April 8, 2008 Espresso3D is available under the open source LGPL license.
The OpenGL Extension Wrangler Library (GLEW) is a cross-platform open-source C/C++ extension loading library. GLEW provides efficient run-time mechanisms for determining which OpenGL extensions are supported on the target platform. OpenGL core and extension functionality is exposed in a single header file. GLEW has been tested on a variety of operating systems, including Windows, Linux, Mac OS X, FreeBSD, Irix, and Solaris.
OGLE (i.e. OpenGLExtractor) is an open source software package by the Eyebeam OpenLab that allows for the capture and re-use of 3D geometry data from 3D graphics applications running on Microsoft Windows. It works by observing the data flowing between 3D applications and the system's OpenGL library, and recording that data in a standard 3D file format. In other words, a 'screen grab' or 'view source' operation for 3D data.