The Rubinius team regularly releases versions of the software. The releases are primarily source code releases. That means that the version number and release date are set, and a repository tag is created to demarcate the release.
The Rubinius team also creates a binary installer for Apple OS X and, when it is supported, for Microsoft Windows. We do not generally create packages for other operating systems but we gladly assist package authors to do so. There are presently Rubinius packages for a variety of Linux and Unix operating systems.
The current release of Rubinius is always listed on the far right of the navigation menu at the top of the screen.