The best open source alternative to AudioRelay is Audio Share. If that doesn't suit you, our users have ranked more than 10 alternatives to AudioRelay and eight of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to AudioRelay are SonoBus, PairPods, Snapcast and Stream What You Hear.
Audio Share can share Windows/Linux computer's audio to Android phone over network, so your phone becomes the speaker of computer. (You needn't buy a new speaker😄.).
Audio Share is the most popular Windows, Android & Linux alternative to AudioRelay.
Audio Share is the most popular Open Source & free alternative to AudioRelay.
SonoBus is an easy to use application for streaming high-quality, low-latency peer-to-peer audio between devices over the internet or a local network.
SonoBus is the most popular Mac, iPhone & iPad alternative to AudioRelay.
A macOS menubar app that lets you share audio between two Bluetooth devices simultaneously. PairPods makes it easy to create shared listening experiences.
Snapcast enhances audio players, creating a multiroom solution with synchronized playback via client-server architecture. It allows simultaneous audio feeds and client grouping, integrating well with MPD and Mopidy for perfect audio distribution.
Stream What You Hear (SWYH) is a Windows application to broadcast the sound of your computer (ie: “what you hear”) on an UPnP/DLNA device such as TVs, amps, network receivers, game consoles, etc...
Audio Source forwards Android microphone audio input to the PulseAudio daemon through ADB, so you can use your Android device as a USB microphone.
A web-based audio streaming solution with a graphical user interface. Captures audio from the user's microphone, streams it to a server, and plays it back through a virtual microphone sink. (Linux only for now)
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Not even close as alternative, Sonobus it's oriented into a Discord-like functionality, AudioRelay shares audio from your PC to your phone, completely different purposes.