// Ars Technica
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In September, Google launched ARC—the "App Runtime for Chrome,"—a project that allowed Android apps to run on Chrome OS. A few days later, a hack revealed the project's full potential: it enabled ARC on every "desktop" version of Chrome, meaning you could unofficially run Android apps on Chrome OS, Windows, Mac OS X, and Linux. ARC made Android apps run on nearly every computing platform (save iOS).
ARC is an early beta though so Google has kept the project's reach very limited—only a handful of apps have been ported to ARC, which have all been the result of close collaborations between Google and the app developer. Now though, Google is taking two big steps forward with the latest developer preview: it's allowing any developer to run their app on ARC via a new Chrome app packager, and it's allowing ARC to run on any desktop OS with a Chrome browser.
ARC runs Windows, Mac, Linux, and Chrome OS thanks to Native Client (abbreviated "NaCL"). NaCL is a Chrome sandboxing technology that allows Chrome apps and plugins to run at "near native" speeds, taking full advantage of the system's CPU and GPU. Native Client turns Chrome into a development platform, write to it, and it'll run on all desktop Chrome browsers. Google ported a full Android stack to Native Client, allowing Android apps to run on most major OSes.