GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
Windows 10 Firewall Control - Windows 10 Firewall Control: simple and exhaustive solution for applications network activity controlling and monitoring.
FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
TinyWall - Lightweight and non-intrusive firewall
NetTraffic - Essential network bandwidth monitor.