
https://github.com/jokob-sk/NetAlertX
Network intruder and presence detector. Scans for devices connected to your network and alerts you if new and unknown devices are found.
https://github.com/leiweibau/Pi.Alert
Scan the devices connected to your WIFI / LAN and alert you the connection of unknown devices. It also warns if a "always connected" device disconnects. In addition, it is possible to check web services for availability. For this purpose HTTP status codes and the response time of the service are evaluated.