SiteOrbiter 7.2.1 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac application is a product of Alex Nygren. We recommend checking the downloaded files with any free antivirus. The software lies within Developer Tools, more precisely Webmaster Tools.
From the developer:
SiteOrbiter is a visual reporting tool for web developers and administrators. It enables the user to:
Graphically report on broken or moved links to both local and remote web addresses
Instantly understand a web site's complexity and depth
Search across the entire site for particular page characteristics, such as number of inbound or outbound links, find all links to a particular page or type of page, or http information.
You may want to check out more Mac applications, such as Boks, Navicat for Oracle or GoodPage, which might be related to SiteOrbiter.