eunux.net is an operating system that parodies Linux that is present in Grand Theft Auto IV. The OS was created in the early 1990s as a clone of the commercial ANIS operating system by a Scandinavian teenager named Eunus, a play on Linux kernel architect Linus Torvalds. Eunux's mascot is Sux the Sea Cucumber, which parodies Linux's mascot Tux the Penguin. Like the real-life OS, Eunux is available in several distributions (distresses), including RedTwat, Ucuntu, Slackcrack, and Knobbix, which are parodies of Red Hat Linux, Ubuntu, Slackware, and Knoppix, respectively. Eunux's main website, www.eunux.net, details the history and goals of the Eunux OS and its community. The website makes fun of the misconception that Linux is a difficult operating system to learn. Eunux is considered the male-only world of open source software and discourages females from using the OS. Eunux is also a word pun on "eunuchs", or castrated individuals.

There are internet news articles talking about a young woman in Alderney City that was discovered to have installed the open source operating system. The Eunux community has launched a hate campaign against her.

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