Little Snitch

Alerts you about outgoing network connections.

The Little Snitch Network Monitor shows you where your Mac connects to on the Internet. You decide what you want to allow or deny.

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. runs inconspicuously in the background and it can even detect network-related activity of viruses, trojans, and other malware.