- ipgeolocation
- MUF-RT Note: MUF-RT data for this map are from GIRO collected and used by permission from KC2G. You may not use OHB for commercial use if planning to utilize KC2G data. Link: https://prop.kc2g.com/acknowledgments/
- Space Weather Prediction Center
- NASA for SDO and STEREO images
- SILSO
- OpenMeteo
- National Research Council Canada 10.7 cm solar flux data
- HamWeekly.com
- OpenWeatherMap
- Reverse Beacon Network
- NG3K.com
- ARNewsline.com
- PSKReporter by Phillip Gladstone
- AMSAT
- WSPR Live
- WA7BNM Weekend Contests Calendar
- Amateur Radio Country Files
- Parks on the Air
- Parks 'N Peaks
- CQGMA
- NOAA NOMADS
- World Data Center for Geomagnetism, Kyoto
- Python port of DVOACAP HF propagation prediction engine by Joel Morin - VE1ATM
- Celestrak
- Space Weather Canada