With Clusteroid you can connect to a telnet cluster and receive the spots with your mobile phone or tablet.
You can also load your DXCC status from the RXCLUS.DAT file or from a log in ADIF format.
When a new country (all-time new one, or on a new band/mode, or a country that you already worked but still not confirmed) is spotted Clusteroid then warns you.
If you are an avid DXCC hunter or a simple ham radio operator you'll find this app useful.
Available in english, french, german, italian and spanish.