Let's face it, software is constantly phoning home or sharing information about you without your consent. Little Snitch takes the guesswork out of what sort of information or requests your computer sends out and asks you if you wish to allow something just this once, forever, or never. If you're dealing with sensitive information on your Mac, be sure you know what the software you have installed might be doing with it. Little Snitch will constantly tattle on the software you feel is your friend if it is doing something you might not be aware of. Review collected by and hosted on G2.com.
I love how intuitive the protection is. You don't need to know anything about firewalls to get custom-tailored protection in terms of what sort of connections the software you install is sending out to third parties or phoning home. Review collected by and hosted on G2.com.