Zeroconf is a Working Group of the IETF.

HeathJohns article compares it to MsWindows Universal Plug N Play (SOAP-based, patent-restricted).

Linux[[OS]] |project Apple RendezVous page - The Mac OS X mDNS Responder source code is available for download from the Darwin CVS repository. This package includes platform specific code for MacOs X, Linux[[OS]] and MsWindows, and also includes helper applications for browsing and advertising services. (it's Open Source)

Howl is an Open Source Cross Platform library.

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