W3KM`s - Free Ham Radio Software
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GitHub - miaowware/callsignlookuptools: An API interface for various ham radio callsign lookup sites in Python, including QRZ and callook.info
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Quick Amateur Radio Prefix Lookup Software
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AB6ME - Callsign Lookup by QRZ Ham Radio
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Ham Radio Deluxe User Guide: Logbook | Callsign Lookup : Ham Radio Deluxe Customer Support
