APRS Digipeater and iGate

 Aprx is an APRS specific Digipeater and iGate.
 It supports multiple KISS-TNCs on serial ports and listening
 to any kernel AX.25 network interfaces.
 .
 Additional features include a built-in "erlang-monitor" to analyze
 activity level of radio channels.
 .
 This software requires a valid (and unique) ham radio callsign to
 operate fully and is therefore useful mainly for licensed radio
 amateurs.