Neumi / open_echo

Open Source echo sounder / depth sounder / SONAR for bathymetry and research. Arduino based and compatible.

bennjordan / Wavest

A mobile-friendly web-based ultrasonic communicator that supports callsigns and encryption.

zeloras / through-metal-link

Open platform for ultrasonic power and data transfer through solid metal walls — through steel without a single hole

bennjordan / BUM16

BUM16 (Benn's Ultrasonic Modem using 16-FSK)

Mavic-Pro / ultrasniff

An Android toolkit that detects, visualizes, decodes, and maps the inaudible ultrasonic signals around you, including the covert "ultrasonic beacons" used to track people across their devices.