www.metageek.com

Identify and eliminate the three main causes of Wi-Fi interference. MetaGeek has industry-leading solutions for Wi-Fi troubleshooting tools for home, office and large enterprises.

This software is not cheap but if you are looking for profession ...

www.pingplotter.com

PingPlotter helps pinpoint network problems in an intuitive graphical way, and continues monitoring connections long-term to further identify issues.

thesz.diecru.eu/content/portscan.php

Find all active devices on your network. PortScan shows all open ports and additional information about HTTP, FTP, SMTP, SNMP and SMB services.

oss.oetiker.ch/smokeping/

• Best of breed latency visualisation.
• Interactive graph explorer.
• Wide range of latency measurement plugins.
• Master/Slave System for distributed measurement. ...
  Visited82