There are many alternatives to OpenSolaris for Mac and since it's discontinued a lot of people are looking for a replacement. The best Mac alternative is macOS, which is free. If that doesn't suit you, our users have ranked more than 25 alternatives to OpenSolaris and three of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to OpenSolaris are Damn Small Linux and illumos.
A Unix-based OS for Mac with seamlessly integration with Apple’s ecosystem, offering an intuitive UI, productivity tools like Finder, Spotlight, and Automator, built-in apps like Safari and Photos, Continuity for cross-device functionality, and security features including FileVault and Gatekeeper.
illumos is a free and open-source Unix operating system. It derives from OpenSolaris, which in turn derives from SVR4 UNIX and Berkeley Software Distribution (BSD). illumos comprises a kernel, device drivers, system libraries, and utility software for system administration.
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