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XreaL is a heavily improved Quake 3 Arena engine. It's bundled with new tools and a demo game that was never finished. ET:XreaL is a subproject bringing all XreaL enhancements to Return to Castle Wolfenstein: Enemy Territory.
A collection of tools to help in the creation of 3D graphics which are to assist in and improve various areas of the production pipeline in particular the creation and management of very large scale 3D graphics scenes.
Paessler: Easy to Use With Enterprise Power. Free Trial
A low-code dashboard makes monitoring intuitive for any admin, while scripting and custom sensors give experts full control.
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Realtime 3D game/visualization engine, written in C++, scriptable through Tcl/Tk, Python and Lua. Supports D3D and OpenGL for rendering, runs under Linux and Windows.
Over is a space-based comic-like RTS game with some MMO features (persistency, commander profile, etc...) It also features customizable fleets and wings. Over is build on a completely custom engine which currently runs on linux and windows.
ShadeGE is an example implementation of features present in a modern 3D game engine. Games can be written using scripts in Python or Lua, or through the C++ API directly.