You could have downloaded BigBrowser 0.1 for Mac from our software library for free. The application is included in Internet & Network Tools. This free Mac app is an intellectual property of Caravane Media.
From the developer:
Big Browser is a light application built with Adobe AIR technology (Flex). It can display multiple websites in a single window. You can compare two or more websites without having to switch between windows or tabs. Or administer a website from a CMS (i.e. Joomla, Drupal) and view the updated result of the public site.
You may want to check out more Mac applications, such as ARDT Browser, ryc-server or JanusVR, which might be similar to BigBrowser.
Browsers