GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
Symantec Email Security.cloud - Symantec Email Security.cloud provides always-on, inbound and outbound email security against malware, targeted attacks, and advanced threats
TinyWall - Lightweight and non-intrusive firewall
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Little Snitch - Little Snitch is a firewall application that monitors and controls outbound internet traffic.
SonicWall - SonicWall security solutions protects your network, systems, users and data from cyber threats.