SpeakerShare

This is a Java application to use the speaker connected to other computer on the network.

15 Alternatives To SpeakerShare

AudioRelay

Wirelessly stream all of your PC’s audio to your phone in real-time. Listen to your Music, Movies or Gaming sessions.

Porthole

Play all audio from your Mac through multiple AirPlay speakers at the same time. iOS 11 and macOS 10. 13 High Sierra both add multi-room AirPlay support to the operating sytem, making Porthole redundant.
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Stardock Acoustic Bridge

Acoustic Bridge gives you the power to redirect audio from one PC to the speakers of another PC.