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You can stream to different speakers, laptops, mobile phones in parallel.
It's really good as DLNA server and you can have him on Linux, Mac, Windows, NAS, BSD.
I'm not sure on the FLOSS status, there are a lot parts from this development on sourceforge and github.
And yes, it's running local as your server without any ties to Logitech.
Give version 7.7 up to 7.8 a try, higher ones are crippled.