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Is an official flavor of Ubuntu that is tuned to the needs of Chinese users, providing a thoughtful and elegant Chinese experience out-of-the-box.
A free, open source cross-platform flight simulator developed by the FlightGear project since 1997.
A powerful open source cross-platform solid modeling system that includes interactive geometry editing, high-performance ray-tracing for rendering and geometric analysis, a system performance analysis benchmark suite, geometry libraries for application developers.