Humviewer is used by many. It allows you to view and create waypoints, tracks, measure.
I also downloaded and added the HB Brown color pallete.
DeepView FV might have a little better display of recordings(IMO), but you will need to use Son2TXF to convert your recording's .DAT file to a .XTF file that DeepView can read. You cannot create waypoints or tracks in DeepView.
YellowFin is also used by some and you again will need to convert the HB recording .DAT file by using HBSI Sonar Data File Converter.