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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 2D and 3D, cross-platform, free and open-source game engine released under the MIT license.
A free Open Source 2D Computer-Aided Design (CAD) application for Windows, Apple and Linux.