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A free, fast, secure, and highly portable Unix-like open-source operating system.
An open-source, free-to-play hardcore arcade/RPG. You start as a pilot of a small fighter ship on the edge of a star system, and you're free to explore the game world, land on planets, fight with enemies, upgrade your ship and equipment, hire mercenaries, mine asteroids, and more.
An open-source multiple-platform application for interactive, scientific visualization. It is designed for data parallelism on shared-memory or distributed-memory multicomputers and clusters.