Mobilio has released SEOSpyder for Mac OS X. It's site crawling and SEO analysing software that allows you to find, trace and fix various types of mistakes and errors which from an SEO point of view could be disastrous for you site.

SEOSpyder is designed to take the processes of maintaining and optimizing your site to a new level, according to the folks at Mobilio. It's a tool for solving and fixing various SEO problems and mistakes that may be unnoticed by the users, but won't be missed by the search engine crawlers -- unnecessary redirects (3xx), images with no alt attribute, links leading to 404s, pages with more than one H1 or links with too long anchor texts.

SEOSpyder 1.0 requires Mac OSX 10.6 or later. It costs US$99.99 and is available worldwide through the Mac App Store (http://tinyurl.com/lzvwxxa) in the Business category. There is also a free (zip) version which can be found on Mobilio's website (www.mobiliodevelopment.com/). It has a crawling limitation of 500 Links.