Top Alternatives to ZoneAlarm Free Firewall

Little Snitch is an essential network monitoring and firewall tool for macOS. It provides granular control over your Mac's network connections, alerting you whenever an application attempts to connect to the internet and allowing you to decide whether to permit or deny the connection.

GlassWire is a powerful network security monitoring tool and firewall that visualizes your network activity. It helps you see what applications are using your internet connection and alerts you to potential threats.

Simplewall is a robust and lightweight firewall application for Windows, designed to control and monitor network activity for applications. It leverages the Windows Filtering Platform (WFP) to provide granular control over outbound connections, enhancing privacy and security by allowing users to block unwanted network communication.

Gufw is an intuitive graphical frontend for the Uncomplicated Firewall (UFW), providing a user-friendly way to manage iptables. It simplifies firewall configuration for Linux users, allowing control over network traffic and application access with ease.

TinyWall is a free, robust, and unobtrusive firewall for Microsoft Windows, designed to enhance system security without the constant barrage of pop-up notifications often associated with traditional firewalls.

Windows 10 Firewall Control provides a robust and intuitive interface for meticulously managing network access by applications on your Windows 10 system. It goes beyond the built-in Windows Firewall, offering fine-grained control and real-time monitoring for enhanced security and privacy.

Windows Firewall Control is a powerful and easy-to-use front-end for the native Windows Firewall. It offers intuitive control over network connections, allowing users to create, modify, and delete firewall rules with greater flexibility than the built-in Windows interface. It provides quick switching between filtered modes, network monitoring, and enhanced security features.

Privatefirewall is a layered endpoint security solution offering proactive protection against network-based attacks and malware for Windows operating systems. It combines firewall, intrusion detection, and application control in a single package.

PC Tools Firewall Plus was a free personal firewall software designed to monitor network traffic and protect users from unauthorized access and malicious threats. It offered features like real-time protection, application control, and network monitoring to enhance online security.

Radio Silence is a macOS firewall designed to easily monitor and block unwanted network connections from applications, enhancing your privacy and security by preventing apps from sending data out without your consent.

Windows Firewall Notifier (WFN) is a lightweight, portable utility that extends the native Windows Firewall's capabilities, providing real-time connection monitoring, bandwidth usage tracking, and granular control over outbound network connections.

Hands Off! is a powerful macOS-based application that provides comprehensive control over your computer's network connections and disk access, protecting your privacy and security by preventing applications from sending out data or accessing files without your consent.