The latest stable release is 3.3.5, dated 16 April 2013.
There is also the previous release series 3.2.5, dated 16 April 2013, to be downloaded here.
To get notifications of new releases, subscribe to the low volume announcements mailing list.
The sources of included {b,d}ash shell binaries can be downloaded here.
There are also Debian GNU/Linux packages available from http://non-gnu.uvt.nl/debian/squeeze/domjudge/ for i386 and amd64 architectures. The packages work on Lenny, Squeeze and newer, and also on the various versions of Ubuntu.
You can add the following apt source to /etc/apt/sources.list which is
signed with this key:
deb http://non-gnu.uvt.nl/debian squeeze uvt
We also provide DOMjudge-live USB images to run DOMjudge straight from an USB stick (it can also be written to harddisk or booted in a virtual machine). See the download page for more details on how use these.