COAA

Free
CombiPlotter displays real-time aircraft, spacecraft, weather balloons and ships on one chart
Free
DSCdecoder decodes maritime mobile service messages using DSC, DGPS and Navtex
Free
PlanePlotter decodes and plots aircraft positions on a chart, displaying aircrafts around you using ACARS, ADS-B and HFDL
Free
This software allows you to monitor radio traffic