Downloading Name Stalker 1.2 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. This software for Mac OS X was originally created by Digital Point Solutions.
From the developer:
Name Stalker allows you to track domains you own and 'stalk' domains you don't own. A utility that helps you capture domains you want that may not be available currently. Free for up to 100 domains.
You may want to check out more software for Mac, such as StalkerEyes, S.T.A.L.K.E.R. The Lost Alpha or The Torment of Whitewall Collector's Edition, which might be related to Name Stalker.