PiFunk Radio Transmitter - with FM/AM-Modulation for HAM-Bands (CB 27 & PMR 446)

Simple web-based tool to generate APRS-IS callsign passcodes for the APRS-IS network.

Callsign.js is a library for fuzzy querying various radio stations callsign information

Downloads the latest ham radio call sign (pdf) file from the Bundesnetzagentur web site and transposes its content to a CSV format

ARRL Ham Radio Call Sign Search

Finnish Radio Amateur callsigns

Aircraft Registration Prefix Dataset

Specification for Amateur Radio Numeric Callsign Encoding (HAM-64/Ham-Addr)

Application for parsing Amateur Radio callsigns.

Query the Canadian Amateur Radio Callsign Database

C# application to ingest a CSV file of data points and return a CSV file containing information from the FCC ULS database.

Call Lookup plugin for the V3NEA Ham Cockpit

Kıyı Emniyeti Genel Müdürlüğü Çağrı İşareti Sorgulama

GUI and command-line program to fetch amateur radio call sign information

dump1090 JSON alarm parser

📻 Highlight call signs in web pages with this JavaScript library

HAM Radio Callsign Lookup

System for detecting and recognizing callsigns in text transcripts of aviation VHF communication.

A script/library to convert callsigns to 16-bit, HAM-64, EUI-48, and EUI-64 formats.

An app for quickly finding out what country / DXCC entity the callsign belongs to