Download of AdwareBuster 0.5 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This Mac application is an intellectual property of Kromtech Alliance Corp. The software belongs to Security Tools.
From the developer:
AdwareBuster is an application that helps you scan your Mac for adware, unwanted apps, and browser extensions, which can make your Mac slow and weak. It lets you remove all items that you don't want to be on your Mac. In addition, you can set up the automatic scan of your Mac to keep it clean from adware and unwanted apps.
You may want to check out more software for Mac, such as Padlock OS X, SecuriSSH or Tattletale, which might be similar to AdwareBuster.