HTML Tidy Widget
Our website provides a free download of HTML Tidy Widget 1.1 for Mac. The application lies within System Tools, more precisely Dashboard Widgets.
From the developer:
HTML Tidy Widget allows you to use HTMLTidy to clean up your HTML code directly from your Dashboard. You just need to enter your HTML code, click "Tidy It!", and you will get nicely formatted valid HTML, XHTML, or XML, and a list of any errors and warnings encountered.
You may want to check out more Mac applications, such as Balthisar Tidy, Calculator Widget or QSS Widget, which might be related to HTML Tidy Widget.