In the FREE version, you get NG Firewall platform, free apps, and 14 days trial of paid features. Smoothwall Express is a free solution with a simple web interface to configure, manage the firewall. Smoothwall express supports LAN, DMZ, Internal, External network firewalling, web proxy for acceleration, traffic stats, etc. Browse free open source Firewalls software and projects for Mac below. Use the toggles on the left to filter open source Firewalls software by OS, license, language, programming language, project status, and freshness.

• Free Firewall For Macbook
• Zonealarm Free Firewall For Mac
• Best Free Antivirus And Firewall For Mac
• Free Firewall For Mac Os X

1. Free firewall is a full-featured professional firewall that protects against the threats of the Internet. Control every program on your computer by permit or deny access to the Internet. Free firewall notifies you when applications want to access the Internet in the background without your knowledge. In monitoring mode, no software can access the Internet or network without your prior authorization.
2. Trend Micro lacks a firewall, for example, or protection for the likes of online banking - the firm’s Pay Guard secure browser is reserved for the Maximum Security for Mac suite.

How to Enable Mac Firewall and Configure It. It’s easy to think that your Mac is safe on the Internet. While macOS isn’t nearly as vulnerable as Windows, Mac owners should still consider using a firewall to protect their computers from unwanted intrusion.

The first layer of protection you should use is a firewall, which blocks applications and services from accessing your computer. Follow these steps to set up your Mac firewall.

What is a Firewall?

The firewall acts as a barrier between your computer and the nefarious software on the Internet. It protects your computer by blocking access to it and allowing only those applications and services that you trust.

macOS has a built-in firewall that we recommend using in place of a third-party firewall or antivirus software. These third-party software packages run on top of macOS and can slow down your system. The macOS version minimally affects the performance of your computer. It runs in the background and you don’t even know it is there.

How to Enable the Mac Firewall

Like most macOS settings, the Firewall Control Panel is found in macOS System Preferences. It only takes a few steps to enable the firewall. Use the instructions below to turn on the Mac firewall and then configure it as needed.

1. Choose the Apple menu in the upper left corner, and then choose System Preferences.

1. Select Security & Privacy.

1. Select the Firewall tab.

1. Click the lock icon in the lower-left corner to unlock the settings.

1. When prompted, enter an administrator’s name and password.

1. Select “Enable Firewall”.

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This will enable the Mac firewall with default settings. Most applications will be blocked, although some system applications, services, and processes may pass through the firewall. If everything works as expected, you can start using your computer and forget about the firewall knowing that it protects you.

How to Configure the Mac Firewall

You need to turn on the Mac firewall and then configure it so that your main applications are not blocked. You can also block applications and services that may pose a threat.

1. Choose the Apple menu in the upper left corner, and then choose System Preferences.

1. Select Security & Privacy.

1. Select the Firewall tab.

1. Click the lock icon in the lower-left corner to unlock the settings.

1. When prompted, enter an administrator’s name and password.

1. Select Firewall Options to configure the firewall.

1. There are several options that can be changed in the firewall options. The first is “Block all Internet connections.” This setting blocks all incoming connections and should only be changed if you know you will not be using any file sharing, remote access, or similar applications that rely on the incoming connection.

1. The next parameter you can change is Add +. This allows you to add an application or service, which can then be set to Allow incoming connections or Block incoming connections. You can also select Uninstall to remove a service or application from the Mac firewall.

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1. The next two sections – Automatically Allow Firmware to Receive Incoming Connections and Automatically Allow Downloaded Signed Software to Receive Incoming Connections – are enabled by default. These settings automatically add trusted and trusted applications to the firewall’s allowed applications list.This is a handy feature that adds these entries without having to authorize every application or service you install. We recommend leaving these enabled unless you want granular control over the firewall access granted to applications you have installed.

1. The next step is to enable stealth mode. This stealth mode setting tells your Mac to ignore incoming connections that check your computer and ask for information without authorization. This setting blocks unauthorized requests from hackers and malware, but does not block requests from authorized applications and services.It is usually not necessary to enable this setting at home as most home routers offer similar protection. It would be nice to enable this setting if you are not using a router and are connecting directly to the Internet. It can also be useful when using insecure public networks.

1. When you are finished making changes, you can click OK.

1. Last but not least, there is an advanced settings menu that you can use to further protect your computer. In most cases, you do not need to change these settings. They allow you to limit the amount of time a user logs on to a Mac when idle and prevent users from changing locked system preferences without an administrator-level password.

Using the Mac Firewall

It is impossible to talk about home network security without talking about a firewall. This is the first line of defense against outside attacks. It blocks unauthorized traffic and prevents malware from infecting your computer. Mac Firewall is free.

It adequately protects your computer’s data and practically does not affect its performance. If you spend a lot of time on the Internet, you are strongly advised to turn on the Mac firewall. This is even more important if you are going to public places with your laptop.

The firewall in macOS is easy to turn on / off, so if you decide you don’t want it running in the background, you can turn it off in less than a minute.

How to Enable Mac Firewall and Configure It

How to Enable Mac Firewall and Configure It

Mac OS claims that there is no need to install any antivirus, or any such security in your Apple Mac, because there is no way your Mac will ever get affected by a virus. Following the claim, most Mac user does not have any antivirus, or even any firewall installed in their laptops/desktops, which can actually prove helpful for the hackers. Therefore the recommended thing to do is to activate a firewall for protecting your important information from being hacked, as well as from stopping Trojan and other such virus from sending information from your system.

Little Snitch is one such firewall application, that helps in protecting your private data from being sent out as well as from being hacked by hackers. But, Little Snitch is not the only application that works like the firewall, there are few other applications as well that acts as the firewall for Mac OS. Below mentioned is a list of few such free apps that you can install to protect your privacy.

Radio Silence

The most useful and handy app for all the others is Radio Silence. It is a small app that allows you to particularize and block all the apps you want from accessing the internet. Moreover, it is very user-friendly and is designed for all those who are not at all tech savvy and don’t want to go into the very detailed configuration. The best thing about radio silence is, you can install and forget about it, as it does not require any specific maintenance neither does it interrupts you by creating pop-ups. Also, it is quite fast and takes only a little of your system space.

Radio Silence lets you keep a list of apps that aren't allowed to go online.

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Prevent apps from phoning home

Save on bandwidth and data charges

Radio Silence is completely invisible

The firewall is invisible and always active. You don't have to keep any windows open.

Free evp software. No annoying pop-ups

No clutter on your screen or dock

No effect on your Mac's performance

Radio Silence’s network monitor shows you every network connection in real time.

If you find a misbehaving app, you can block it with a single click.

Radio Silence exposes everything

Find the hidden helpers and background processes apps use to make connections:

Hands Off

Another amazing app, that helps in protecting your private data. The app runs silently, and only when an application tries to send out any data, hands off takes a step and notifies the user about it. The best thing about Hands Off is, it blocks a certain app and thus keeps the system protected, till the user personally unblocks it. Hands Off are known for blocking both incoming and outgoing data. It further protects the system from Trojans, warms etc. You can certainly try it out once. After all, it's free.

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.

When connected to the Internet, applications can send any information stored on your computer to whoever they want without you ever knowing. Using Hands Off!, you can monitor and control Internet connections from all applications as to expose hidden connections and prevent them from sending data or phoning home without your consent.

Applications present on your computer can freely read, store or erase information on your computer without your knowledge. Using Hands Off!, you can monitor and control disk access from all applications as to prevent them from obtaining confidential information, erasing your data or storing cookies.

Murus

It is a basic level free app that can be downloaded as well as used for free. It is mostly designed for the novice, and can be used by those who do not have a lot to protect. It features inbound filtering and logging and can be used to protect services running on the Mac. The basic functions of Murus include filtering of incoming data.

Murus Lite is free for both personal and commercial use.

IceFloor

IceFloor is a graphic PF firewall. It is known for regulating PF configurations, logging, bandwidth, different kinds of filtering and etc. many more connections. The functioning of it can be a bit complex for some, because it is known for creating different groups which further blocks or passes the connections, assigns parameters, addresses etc.

IceFloor is a free and open source graphic interface for the OS X built-in PF network firewall.

IceFloor is group based. Create groups and assign addresses, services and parameters to pass or block connections

makes use of its own set of PF configuration files; default OS X PF configuration files in /etc are not modified by IceFloor

start with IceFloor Wizard to create a basic PF configuration in a few mouse clicks

use IceFloor interface to set up very complex and customized PF rulesets

manage inbound and outbound connections with filtering and bandwidth rules for your Mac and NAT clients

hide services using port knocking, list and block connections on the fly using Inspector

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create new configuration presets and easily switch between predefined and custom PF presets

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mix IceFloor PF rules with your custom PF rules, interact with external applications like sshguard

share Internet connection using PF NAT, assign per-client filtering and bandwidth rules and redirections

browse PF ruleset with the new PF Rules Browser, display filtering, bandwidth and NAT PF rules and pipes

analyze PF logs with numerical and graphical statistics, enumerate remote hosts using stroke or nmap based GUI tools

debug and test PF rulesets easily and quickly using the optional IceFloor Menulet

IceFloor requires OS X 10.7 or later. Some features requires OS X 10.8 or later.

Note: While the software is classified as free, it is actually donationware. Please consider making a donation to help support development.

Flying Buttress

Flying Buttress is for those who intend on having a strong and high-end firewall system. This is for those people who want advanced firewall system. Flying buttress performs all kind of advanced works like it filters host or various network addresses. It discerns configurations based on their networks, it also helps in forwarding and configuring NAT and many more. Flying Buttress is usually not recommended for day to day use, unless you are looking for some high-end system to protect your data.Besides the above-mentioned ones there are few other free firewall apps for Mac like –

Firewall filters that include qualifiers on host or network addresses

Firewall filters that operate on other than TCP or UDP protocols

Firewall filters that include the whole range of ipfw qualifiers, such as IP options, ICMP types or TCP flags

Per-filter logging configuration, including the ability to log allowed connections and the option to not log certain types of denied connections

NAT port forwarding or other custom NAT configuration

Different filter configurations on different network interfaces.

A persistant, searchable firewall log entry database with graphical log viewer

Scriptable control of your firewall, such as via cron or other shell automation

Access and ability to easily edit the raw firewall configuration text, including an integrated ipfw filter syntax checker.

The ability to switch between different firewall configuration sets quickly and easily.

Rubbernet

Rubbernet helps in keeping an eye on all the network-based apps. It keeps a tag of all the activities of the specified apps and monitors the data shared over those apps. It also provides an in-detailed usage of the network of every app.

Real-time network dashboard:

Rubbernet 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.

App bandwidth usage:

Rubbernet provides a breakdown of per-app network usage, so you can quickly detect apps that phone home, connect to certain servers without your knowledge, or blame the app that's slowing down your network.

Live graphs:

Real-time charting displays download and upload transfer rates for all active apps on all monitored Macs. Visualize your network usage and get a bead on network hogs before they get out of control.

Monitor all computers on your network from one Rubbernet instance on your Mac. No need to get up and open Rubbernet on a remote Mac to see its network statistics. Unlike other network monitoring tools, there is no complicated setup. It takes just a second to install or uninstall the necessary tools for Rubbernet to work. After that, they sit quietly in the background and provide the app with live data with minimal resource consumption.

LuLu

LuLu is used for blocking all unsanctioned outgoing network transfer. It does not have many functions, and only provides protection against sharing unauthorized data.

TripMode

It has only one particular function and that is to block the internet connection for the specified applications.

TripMode automatically reduces your mobile data consumption when you use a mobile hotspot

Only apps that you’ve selected are allowed to access the Internet when TripMode is ON. The rest is blocked.

TripMode activates itself on networks where you used it before. No need to fiddle in menus. Kies for mac catalina.

See how much data was used per app and per session, day, or month. Spot the data hungry apps.

However protected your Apple Mac is, it is always safe to have a firewall application installed, for none of us wants our personal data to be leaked. Firewalls are important, it does not matter which app you choose to install, just having one for basic security is enough.