Post Description

Little Snitch 3.0 is currently in beta. For the latest stable release, see Little Snitch 2.5.3. Little Snitch 3 requires Mac OS X 10.6 or later; 2.5.3 requires 10.4 or later

Little Snitch alerts you to outgoing network connections.

A firewall protects your computer against unwanted guests from the Internet. But who protects your private data from being sent out? Little Snitch does!

As soon as you're connected to the Internet, applications can potentially send whatever information they want to wherever they want.

Sometimes they do this for good reason, on your explicit request. But often they don't. Little Snitch allows you to intercept these unwanted connection attempts, and lets you decide how to proceed.

Little Snitch informs you whenever a program attempts to establish an outgoing Internet connection. You can then choose to allow or deny this connection, or define a rule how to handle similar, future connection attempts. This reliably prevents private data from being sent out without your knowledge. Little Snitch runs inconspicuously in the background and it can also detect network related activity of viruses, trojans and other malware.
What's New
Version 3.0 preview 3 (3862):

New Features and Improvements

    New Online Database for Connections (experimental feature). Little Snitch's Connection Alert now has a help button. Clicking the button triggers a query to an online database (maintained by Objective Development) and displays information about the current connection attempt.
    Rules created by the Connection Alert are now added to the current profile.
    New security preferences for Profile editing.
    Network Monitor: Traffic diagram now supports multi-touch guestures for scrolling and zooming.
    Network Monitor: Active traffic captures are now indicated in connections list.
    Network Monitor: Connections can be copied as plain text from connections list.

Bug Fixes

    Performance improvements in Little Snitch Network Monitor, especially for large lists.
    Little Snitch Configuration now preserves "Sort by" property in rules table.
    Many other bug fixes and improvements.

Requirements
Intel, Mac OS X 10.6 or later 

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