In addition to the web interface at http://www.hamqth.com/dxcluster.php there is also new DX cluster node OK2CQR-1, accessible from telnet hamqth.com 7300. It can be defined in your logging contesting in the following way:
login: your_call_sign (ie. G3ABC)
Congrats to Petr OK2CQR who created this very complex project at http://www.hamqth.com.