So, to now give it the launch that it deserved, for a limited time you'll be able to grab a licence for the new Integrity Plus for free.
Integrity is the best free link checker for Mac, fast, accurate, efficient but no-frills. Integrity Plus adds some frequently-requested features - the ability to manage the settings for multiple sites, and the XML Sitemap functionality (generate, export, ftp) and a few more benefits too.
The offer ran till 7 Feb 2015 and is now finished. But you still get a free, unrestricted trial of Integrity Plus and if you like it, the price is very modest.