ScamZapper 2.1.2 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The actual developer of this free software for Mac is AppleClub. The application lies within Internet & Network Tools, more precisely Browser extensions.
From the developer:
ScamZapper is not like most other pop-up blockers, as it targets a specific kind of pop-up: the worst kind. Some pop-ups will lock up Safari, claiming that your computer is infected by a virus and you need to call a bogus technical support number for help, and this is exactly what ScamZapper is designed to prevent. You can learn more about this scam in our support article here: A Browser Pop-up has Taken Over Safari.
You may want to check out more software for Mac, such as Bwana, G-Force Toolbar or Safari Cookies, which might be related to ScamZapper.