Mask Surf by Thanksoft is an application that protects you while you're surfing the web. Basically, it provides anonymous surfing. However, there is no version of Mask Surf for Mac on the developer's website, which means you will have to search for other tools that have similar functionality. Here is a list with some alternatives to Mask Surf for Mac.
Feel free to add any alternative to Mask Surf for Mac that you know of.
Suggest Alternatives
Is there an obvious need for such apps? I personally prefer the online tools: much easier and safer to use.