Zeroconf Browser macOS
Zeroconf Browser let's you browse nearby Bonjour and Zeroconf/mDNS websites. It includes a Safari extension so you can have all Bonjour websites at your fingertips, without leaving Safari.
PocketPacket iOS macOS
An APRS client for your iPhone, iPod Touch and your Mac. The "Automatic Position Reporting System" is a packet communication protocol used by amateur radio operators (HAMs) around the world, to report position, status, station capabilities, weather or other information in real time.