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A free and open-source Unix-like operating system forked from FreeBSD 4.8. It has diverged significantly from FreeBSD, implementing lightweight kernel threads (LWKT), an in-kernel message passing system, and the HAMMER file system.
A free 3D online multi-player tank battle game available on Linux, macOS, and Windows.
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.