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AX.25 is a data link layer protocol derived from the X.25 protocol suite and designed for use by amateur radio operators.[1] It is used extensively on amateur packet radio networks.

APRS is an amateur radio-based system for real time tactical digital communications of information of immediate value in the local area.

(Digital Smart Technologies for Amateur Radio) is a digital voice and data protocol specification developed as the result of research by the Japan Amateur Radio League to investigate digital technologies for amateur radio.

WSJT is a computer program used for weak-signal radio communication between amateur radio operators. The program was initially written by Joe Taylor, K1JT, but is now open source and is developed by a small team.

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