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To tell you the truth, QNX (pronounced Que-nix) isn't exactly open source software. The QNX company does not want to
give the source away. But it does come with some open source GNU programming tools. You can even port Linux programs
to QNX easily.
If you're an experienced Linux user, QNX will delight you. QNX RTP uses a Linux-compatible command-driven "shell" for many operations, and its file hierarchy is almost the same. But what makes QNX visibly different from Linux is its beautifully designed graphical user interface.