Little Snitch gives you control over your private outgoing data.
Track background activity
As soon as your computer connects to the Internet, applications often have permission to send any information wherever they need to. Little Snitch takes note of this activity and allows you to decide for yourself what happens with this data.
Control your network
Choose to allow or deny connections, or define a rule how to handle similar, future connection attempts. Little Snitch runs inconspicuously in the background and it can even detect network-related activity of viruses, trojans, and other malware.
It helps you prevent running apps from accessing the Internet.
Manage your personal network and block outgoing connections.
Figure out if unauthorized users are spying on you.
Basic IPFW firewall configuration tool for Mac OS X 10.5-10.6-10.7.
Default protection setting which applies to all unspecified services.