iperf - A TCP, UDP, and SCTP network bandwidth measurement tool
TinyWall - Lightweight and non-intrusive firewall
JPerf - This project gives a better UI and new functionalities to the initial JPerf 1.
Windows 10 Firewall Control - Windows 10 Firewall Control: simple and exhaustive solution for applications network activity controlling and monitoring.
NetStress - NetStress is a user-friendly benchmarking tool that is mostly used by networking professionals to measure the network performance of both wired and wireless connections.
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...