You can download MacRuby 0.5 as a standalone binary installer.
Note: this release will only work on Intel machines running Mac OS v10.6 or higher. Users on Mac OS v10.5 can build the sources.
You can download one of MacRuby’s development branch nightly builds, which also come as standalone binaries. Please note that these builds are development versions of MacRuby and might perhaps be unstable.
Note: these builds only work on Intel machines running on Snow Leopard or higher.
You can always get the latest sources from our SVN or GIT repository. Building is trivial:
$ rake $ sudo rake install