geckoOS runs entirely in your browser — no install, no backend. It ships a full Mac-style desktop with a window manager, dock, menu bar, Spotlight search, and a built-in Linux environment (GSL) powered by a virtual filesystem and bash-compatible shell.
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Mac-style desktop — menu bar, dock with magnification, draggable/resizable windows with traffic-light buttons
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GSL (Gecko Subsystem for Linux) — virtual filesystem (IndexedDB), bash-compatible shell, process manager, APT package manager, and
curl/wget -
Built-in apps — Terminal, Finder, TextPad, Settings, App Store, Calculator, Calendar, About
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Spotlight search —
Ctrl+Spaceto search apps and files -
Light & dark themes with accent color picker
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PWA — installable, works offline via service worker
To use it, just go to the GitHub page!