An outstanding companion to WSJT-X is JTAlert.  JTAlert monitors the stations you receive and provides feedback to help you choose which stations to select for a contact.  
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Helpful alerts include:Identifies stations you worked beforeColor codes stations that are calling CQ in greenColor codes stations in grey that are in the middle of a QSOFlags wanted callsignsFlags wanted US StatesFlags DXCCsIgnores callsigns JTAlert is a must-have companion for anyone using WSJT-X.
Good DX and 73, NJ2X