Download of mDNSBrowser 1.0.4 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Internet & Network Tools, more precisely Network tools. We recommend checking the downloaded files with any free antivirus. This software for Mac OS X was originally developed by Netputing Systems Inc. & Handheld Media, LLC.
From the developer:
This application will provide a detailed list of all the Bonjour network advertisements that are broadcasted on your local network. It lets you see TXT keys, resolved addresses, and link-local names. It scans for any present service available on your Mac.
You may want to check out more software for Mac, such as NetCheck, QuickWho or Super Ping Pro, which might be similar to mDNSBrowser.