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TinyWall - Lightweight and non-intrusive firewall
NetGuard - NetGuard
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
AFWall+ - AFWall+ (Android Firewall +) - iptables based firewall for Android
Little Snitch - Little Snitch is a firewall application that monitors and controls outbound internet traffic.
NoRoot Firewall - Firewall WITHOUT ROOT.