Here are some software firewalls that are available for Apple Macintosh

Product

OS 9

OS X

Comment
Brickhouse  

 
Door Stop

 
FireWalk X

 

A GUI interface to the built in Mac OS X firewall.
IPNetSentry

 
Little Snitch

 

This supervises your applications and monitors the subtle transmissions of applications that look for new versions, send homing signals, etc.
Mason

 

A web interface to the built in Mac OS X firewall.
Who's There?

 

Test the firewall

Now that you have installed a firewall, maybe you want to test it? This site gives a list of web based security tests that you can use now.

One that I have found to be good is ShieldsUP.

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