Best Free Firewall Software of 2026

Cloudflare is the foundation of your infrastructure, applications, teams, and software. Cloudflare protects and ensures the reliability and security of your external-facing resources like websites, APIs, applications, and other web services. It protects your internal resources, such as behind-the firewall applications, teams, devices, and devices. It is also your platform to develop globally scalable applications. Your website, APIs, applications, and other channels are key to doing business with customers and suppliers. It is essential that these resources are reliable, secure, and performant as the world shifts online. Cloudflare for Infrastructure provides a complete solution that enables this for everything connected to the Internet. Your internal teams can rely on behind-the-firewall apps and devices to support their work. Remote work is increasing rapidly and is putting a strain on many organizations' VPNs and other hardware solutions.

Monitor the volume of data your PC is using for every single app, thanks to GlassWire's network monitoring graph. Keep track of the volume of data you received and sent in the past and who or what your PC is talking to. Detect spyware, malware, badly behaving apps, and bandwidth hogs, then block their connections with our powerful firewall. Monitor devices on your network and get alerted when new unknown devices join your WiFi. GlassWire warns you of network-related changes to your PC or unusual changes to your apps that could indicate malware.

The pfSense project provides a free network firewall distribution. It is based on FreeBSD's operating system with a custom kernel. Third-party free software packages are also included. The package system allows pfSense software to offer the same functionality as or more common commercial firewalls without any artificial limitations. It has replaced every major commercial firewall in many installations around the globe, including Check Point and Cisco PIX, Cisco ASA and Juniper.

enforza is a cloud-managed firewall platform designed to unify multi-cloud perimeter security. It offers robust firewall, egress filtering, and NAT Gateway capabilities, enabling consistent security policies across various cloud environments and regions. By transforming your Linux instances—whether on-premises or in the cloud—into managed security appliances, enforza provides a cost-effective alternative to AWS Network Firewall, Azure Firewall, and native NAT Gateways, all without data processing charges. Key Features: Simplified Deployment: Install the enforza agent on your Linux instance with a single command. Seamless Integration: Register your device through the enforza portal for centralized management. Intuitive Management: Easily create and enforce security policies across multiple environments via a user-friendly interface. With enforza, you can achieve enterprise-grade security without the complexity and costs associated with traditional cloud-native solutions.

Comodo Advanced Endpoint Protection delivers an exceptional anti-malware suite that actively safeguards your servers, workstations, laptops, and netbooks, while also providing sophisticated, real-time oversight and management of essential system resources. It can be utilized either as a comprehensive security package or as a standalone sandbox to enhance existing antivirus solutions, making Comodo ESM a top choice for endpoint protection on Microsoft Windows servers, desktops, laptops, and tablets. The complete Comodo Endpoint Security suite boasts five layers of defense—Antivirus, Firewall, Host Intrusion Prevention, Auto-Sandbox, and File Reputation—directly at the user level on the desktop. Its innovative auto-sandbox technology effectively prevents malware infections and operating system damage by executing untrusted processes in a segregated environment. Furthermore, Comodo's endpoint protection is distinguished as the only managed anti-malware solution that offers a limited warranty of $5,000 against malware infections, affirming its commitment to security. This combination of advanced features ensures that users have a robust and reliable defense against evolving cyber threats.

Sophos UTM elevates threat prevention to unprecedented heights. At the core of Sophos Sandstorm is an advanced deep learning neural network, a sophisticated type of machine learning that effectively identifies both familiar and unfamiliar malware without depending on traditional signatures. Notably, Sophos UTM 9.4 stands out as one of the pioneering products to incorporate our state-of-the-art next-gen cloud sandboxing technology. Sandstorm significantly enhances protection against ransomware and targeted attacks while providing comprehensive visibility and analytical capabilities. It swiftly and accurately detects evasive threats before they infiltrate your network. Furthermore, it delivers exceptional value by offering enterprise-quality protection without the burden of exorbitant costs or complexities. You can fortify your web servers and Microsoft Enterprise Applications against cyber threats while ensuring secure access for external users through reverse proxy authentication. Additionally, our unique all-in-one solution guarantees complete SMTP and POP message protection from spam, phishing attempts, and data breaches, enhancing your overall cybersecurity posture. Ultimately, Sophos UTM equips businesses with robust tools to safeguard their digital assets effectively.

Azure Firewall serves as a cloud-managed network security solution designed to safeguard your Azure Virtual Network assets. This service operates as a fully stateful firewall, ensuring both high availability and scalable performance in the cloud environment. It is a comprehensive network security tool that not only protects your resources but also allows for the creation, enforcement, and logging of connectivity policies across various subscriptions and virtual networks. With its robust features, you can streamline the deployment and management of network security, taking advantage of the firewall's scalability and availability. Additionally, it enables centralized management of security settings across multiple virtual networks, employing a unified set of application and network rules for enhanced protection. This makes it easier for organizations to maintain consistent security postures as they expand their cloud infrastructure.

Google Cloud firewalls are intricately integrated into the cloud networking structure, offering scalability and precision to cater to the specific security requirements of your business. They provide a versatile and customizable approach, allowing you to implement protection at various levels, including organization, folder, and project, while maintaining flexible control over your firewall rules and policies. Additionally, you can enhance your security management through visibility and optimization features, which offer valuable insights into the usage of firewall rules and highlight potential areas for improvement. Furthermore, with the use of network tags and service accounts, you can establish detailed controls that effectively manage both north-south and east-west traffic, ensuring comprehensive security across your network. This multifaceted approach not only fortifies your defenses but also simplifies the overall management of your cloud environment.

Open source software and a universal router are key to democratizing the way we access networks. VyOS' vision is to revolutionize how we access networks, so that everyone can build the solutions they have always wanted, without limitations, restrictions, or prohibitive prices. We believe that internet access is just as important to human development as food, water, air, and healthcare. VyOS was founded by engineers for engineers. It is an open-source software company that makes it possible to access networks without restrictions or prohibitive fees. Through our open-source software and virtual platforms, we do this as VyOS. Stateful firewalls, zone based firewall, all types source and destination NAT (one-to-one, one-to many, many to many). For auditing, creating customized images and contributing, everyone has access to the entire codebase and build toolchain.