Here is the DXMonitor software that has always graphically displayed the DX cluster information! The software was created by a guy named VE3SUN, but it is not free. Registration costs $39.95 and can be paid via Paypal.
I put out a CQ on 21MHz today and got many European calls! From 14:00 UTC to 15:37 UTC, moved to 5-7UP in the middle of the day and communicated with 103 stations