LanTopolog is a freeware software that provides physical network topology discovery, visualization and monitoring.
LanTopolog Features:
* Automated physical network topology discovery based on SNMP
* Provide detailed and searchable physical network topology map so you can quickly isolate network connectivity failures
* Monitoring device's state (active/inactive) in real-time using ICMP
* Ability to auto-discovery new devices at they are added to your network
* Generating alarms when there are failures in the network.
* E-mail alerts notifying
* Easy-to-use interface
* Web browser-based access from anywhere in the network

The license of this software is Freeware, you can free download and free use this network utility software.