otter is a commercial Win32 HAM radio application for working with DX Clusters by using TCP/IP protocol for communications. It is adapted to satisfy most DXer's needs.
otter includes 2 programs in one: DXSp
otter for connections via telnet protocol to more than 200 DX Clusters, and DXSp
otter-Summit for connections to OH2AQ's WEB cluster DXSummit page with automatic page refresh (minimum period 1 minute).