SoundIt is an app designed to let you stream your computer's sound output to any device with a web browser easily. Play music loudly without amplifying equipment, just scatter devices in your place, or watch TV using headphones through your phone wirelessly.
Free
Launch Team
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Promoted
Shockingly good. I always thought low latency audio streaming between PCs or devices was only possible with a virtual audio device (e.g. VB-Audio's VBAN software), but I have never been happier to be wrong.
I have been using SoundIt daily for 5 years or so now, since back when it was a browser extension. I run two PCs side-by-side, which is only possible with SoundIt and Microsoft's MouseWithoutBorders. I consider SoundIt to be in my top 10 of most necessary PC softwares.