Unleashed is an operating system fork of illumos (see why), which itself is a derivative of OpenSolaris and therefore has its roots in UNIX System V Release 4.

It is intended as a modern Unix operating system for developers by developers; it comes with ZFS, DTrace, Crossbow and more.

Download & Installation

The only systems currently supported are amd64-based computers and virtual machines.

Unleashed is being maintained as a hobby, and as such we cannot guarantee releasing security or other patches. Run it in production at your own risk.

If you want to build Unleashed yourself, use the latest available development snapshot.

IRC & Mailing Lists

You can find us in #unleashed on Freenode.

We have two mailing lists: one for general development discussions (subscribe, archives) and one with commit notifications (subscribe, archives).

Security sensitive information can be sent to jeffpc@josefsipek.net. If you wish, you may encrypt your message with Jeff's PGP key.


If you want to make Unleashed better, send us a patch, an email, or join us on IRC! We don't have mandatory code review or any other convoluted processes; just show us the code.

The source code itself is split across several git repositories:

The steps to build each vary, but they are documented in each repository's top-level README.


Aside from the typical set of man pages, there is a docs directory in the main git repository.