Little Snitch!

GlassWire is a free network security monitoring tool and analyzer that visualizes your network activity on an easy to use graph, alerts you of possible threats, manages your firewall, and more.

Hands Off! is an application to monitor and control the access of applications to your network and disks. Being able to monitor the normally unnoticeable activities enables you to make informed decisions regarding the transfer of your private information, hence avoiding confidential information leakage.

Radio Silence lets you block individual apps from accessing the internet. It never throws pop-ups on the screen, and is completely invisible.

ZoneAlarm Free Firewall blocks hackers from infiltrating your home PC by hiding your computer from unsolicited network traffic. By detecting and preventing intrusions, ZoneAlarm Free Firewall keeps your PC free from viruses that slow down performance, and spyware that steals your personal information, passwords, and financial data.

Look n Stop is the best in its class security application to prevent spyware. Secured by Look n Stop, your PC also becomes fully invisible to net hackers by stopping all suspicious traffic. Rated among the highest firewall in leak tests. Unlike other firewalls, Look n Stop is optimized to keep your computer and your connection running at peak performance, consuming very little resources. Look n Stop comes preconfigured and ready to use out of the box, you can easily set it up with a few mouse clicks. Look n Stop is detected as a trusted firewall by the Microsoft Windows Security Center (Windows XP SP2). Look n Stop is compatible with ICS - You can share your Internet connection safely between several computers. »

Protects your applications from undesirable network incoming and outgoing activity, controls applications internet access. Allows you to control personal information leakage via controlling application network traffic.

Filseclab Personal Firewall Professional Edition is one of the most important software of Filseclab, it is very easy to use and also very powerful. It can provide more secure protection for your PC, and it is FREE.

Block internet connection for apps.

IceFloor is the first OS X free graphic frontend for PF. Configure the PF firewall in a few clicks using a very simple interface and a step by step in-app configuration guide (Quick Start).

Rubbernet keeps an eye on all network-enabled apps running on your Mac. It provides real-time monitoring so you can keep an eye on the exact state of your live network connections. With the Activity sidebar, you'll be able to see which applications are currently communicating over your network. When connections are idle, they will dim to let you know that traffic has stopped.

Armor2net personal firewall software stops hackers, data thieves, and protects your PC from Internet-borne threats. Armor2net firewall can meet your requirements for Internet security and Internet privacy.

Wallix Pro Firewall prevents intruders from accessing your computer and that’s the main objective for a computer firewall. It automatically detects and blocks attacks through a comprehensive examination of all inbound and outbound information to your computer. Wallix Pro offers an easy interface, with clear details that present you a list with all installed programs from your computer. Unwanted programs can be uninstalled at any time by just a few clicks.

Douane is a personal firewall that protects a user's privacy by allowing a user to control which applications can connect to the internet from their GNU/Linux computer.You can allow network traffic for some applications and deny network traffic for others.

Simple to use bandwidth monitoring software to track Internet bandwidth usage. It remains in tray and displays the bandwidth usage in current session, day and month. This will be helpful for those with limited bandwidth broadband/adsl connection.

With InJoy Firewall™ 4.0 you can say good-bye to old-generation Firewall solutions that were difficult to implement, manage and measure — InJoy Firewall™ is different...