You could have downloaded iDXCluster 1.1 for Mac from our software library for free. This free software for Mac OS X is a product of Black Cat Systems. The program lies within Internet & Network Tools, more precisely Network tools.
From the developer:
iDXCluster is an easy to use DX Cluster program geared towards SW listeners, DXers, utility monitors, and others. A DX Cluster is a way for DXers to share tips on what stations they are currently hearing. Stale DX news is useless, so a DX Cluster allows people to share their loggings within seconds.
You just need to download the program, enter in your Name and location, and that's it.
You may want to check out more software for Mac, such as IPNetShareX, PPPoE Connector or tn3270, which might be similar to iDXCluster.