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BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools.
CIRT is an implementation of PRTP (Programmable Ray Tracing Pipeline). Mainly it is to be used as a ray-tracing equivalent of OpenGL. It allows the user to implement various ray-tracing related algorithms.
PLIB is a set of libraries that are designed to help developers of interactive 3D applications such as games. All PLIB libraries are portable to just about every modern Operating System. PLIB includes OpenGL GUI and scene graph, portable audio, portable
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Virtual Choreographer (VC) is a 3D graphic engine based on an XML language for interactive spatialized scenes. Using the same purposes as X3D, VC is designed to specify complex geometrical scenes. VC focuses on artistic design and multimedia scenes.
RTE is a global illumination engine used for lighting scenes in an interactive 3D environment. It can compute the global illumination, both on the fly or as a pre-compute process. It can be easily tied to existing Scenegraphs/3D rendering engines/games.
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The Simulus Game Engine is a cross-platform, flexible, and easy-to-use game engine and development environment. Written in C++, supports multiple APIs, runs under Linux and Windows.
LightStorm is a photorealistic multi-processor 3D rendering engine written in C/C++ that goes one step beyond Radiosity without the need for ray-tracing tecniques.
sjgui is a gui framework for use in interactive OpenGL applications. The main goal is to provide very easy and fast way to develop portable interactive interfaces, using object-oriented approach. It is easily extendable to suit your needs and is platform
Powerful platform for creating networked multiplayer 3D games. The system includes specifications for a client engine and 2 protocols. Demo apps: mud/moo proxy, tetris. Currently uses OpenGL, VRML, java, tcl. Client/server architecture for security.
The GLOW Toolkit is a cross-platform user interface framework for building interactive applications using OpenGL or similar APIs. It provides an object-oriented API and an extensible library of cross-platform widgets.