Tutorial Zabbix - Monitoring a UDP port status and performance
UDP Monitoring - Dotcom-Monitor
TCP Data Logger and TCP Logger AX allow to monitor, capture and log data from TCP ports | AGG Software
UDP Monitor - Apps on Google Play
GitHub - Megunolink/Arduino-ESP8266-UDP-Monitor: Example application using Arduino and a ESP8266 WeMos D1 to send UDP packets to MegunoLink for data plotting and logging.
UDP Monitor APK for Android Download
UDP Health Monitor
FREE: TCPView – displays active TCP and UDP connections – 4sysops
Display all TCP and UDP network activity on Windows - gHacks Tech News
Live Streaming with integration of Activity Monitor and Timetable with real time information – Sportdata Event Technology
TCP / UDP Port Listener - Monitor Windows 7 Incoming Connection