Best Web Application Firewalls (WAF) for Android of 2026

CacheGuard-OS is an open-source Linux-based UTM gateway appliance OS that has been in active development since 2002. It is designed to run on commodity x86 hardware and act as the default route between an internal network and the internet, replacing the ISP-provided router as the traffic checkpoint. The stack integrates: Squid (web cache and proxy), ClamAV (web antivirus), ModSecurity (WAF), StrongSwan (IPsec/IKEv2 VPN), IPRoute2 (QoS and WAN load balancing), NetFilter (stateful firewall), SSL inspection, and URL filtering. All components are configured through a web-based admin interface rather than directly, making the platform accessible to operators without deep Linux expertise while remaining auditable by those who want to inspect the underlying configuration. The OS has been open-source since its first release — source ships on every installed appliance. It was recently published publicly on GitHub to make the codebase easier to browse and audit. Target deployments are small to medium networks — SMBs, schools, and branch offices — where a commercial UTM appliance is overkill on budget but the threat surface is the same. Runs on bare metal or common hypervisors (VMware, VirtualBox, KVM, Hyper-V). No vendor lock-in, no subscription, no licence cost. GitHub: cacheguard/CacheGuard-OS

Create a reliable and scalable gateway for the swift deployment of your applications worldwide. Seamlessly integrate your dispersed microservices into a unified global application through the use of HTTP load balancing and path-based routing configurations. Streamline the process of launching new regions and scaling operations with API-driven global actions, while ensuring independent fault tolerance for your backend microservices, whether they reside in Azure or elsewhere. Deliver and safeguard your global application near your end users with a robust service supported by Microsoft’s esteemed Global Network infrastructure. Consistently optimize your traffic flow to ensure the most efficient route to your application, enhance service capacity, minimize latency, and boost throughput for users around the globe utilizing edge load balancing and application acceleration techniques. Furthermore, effortlessly oversee domain mapping and manage traffic to your microservice backends through a singular, centralized global dashboard, allowing for greater control and visibility over your distributed architecture. This streamlined approach not only improves performance but also enhances the overall user experience across various regions.