wave-share
Serverless, peer-to-peer, local file sharing through sound
...After the offer-and-answer exchange, the browsers establish a direct WebRTC connection over the local network. The signaling process does not require a dedicated server, application installation, or browser plugin. Its sound packets contain essential SDP details, network information, security fingerprints, credentials, and error-correction data. The project also includes a command-line prototype for sending arbitrary text through its audio protocol. Its data-over-sound technology was later extracted and developed separately as the ggwave library.