Portmaster is a free, open-source application firewall that monitors all network activity on your computer. It auto-blocks trackers system-wide, lets you set global or per-app rules, and even restricts connections by country. Key features:

🔒 System-wide tracker blocking with customizable rules

🌍 Country-based restrictions for tighter control over connections

⚙️ Per-app network policies for granular privacy management

🚀 Integrates with Safing’s SPN (privacy network) (paid) for extra anonymity

🧩 Actively developed, open-source, and community-driven

Perfect for privacy-conscious users who want robust, transparent control over their network traffic without juggling multiple tools.

TinyWall is a free, minimalist firewall for Windows that enhances the built-in Defender Firewall without installing drivers or kernel components. Key features include:

🛡️ Non-intrusive design: no popups, no distractions

⚙️ Tampering protection, blocklists, and boot-time filtering

🧠 Smart rules for UWP apps and temporary exceptions

🖥️ Ultra-lightweight with negligible system impact

🔒 No telemetry, no data collection, no ads—just security

Perfect for users who want robust control over their network without bloated software. A great choice for privacy-conscious Windows users.

Rethink DNS + Firewall is a free, open-source Android app that makes it easy to monitor app activity, block ads and trackers, and circumvent Internet censorship. Key features:

🛡️ Android firewall: prevent apps from connecting to the Internet over Wi-Fi or mobile data

🚫 Content blocking: ads, trackers, malware, and more

🌍 Anti-censorship: encrypts DNS requests to bypass restrictions, with presence in 200+ locations worldwide

📊 Monitoring: logs every app’s connections and data usage

⚙️ Automated reports flag suspicious connections and reveal surveillance attempts

🔒 Privacy-first design, no accounts required

Perfect for anyone who wants system-wide privacy and control over their Android device.