Alternatives to NetAlly EtherScope nXG

Capsa is aimed at network administrators and engineers in small businesses and enterprises who need packet capture and network diagnosis.

PingPlotter

PingPlotter suits home users troubleshooting a network, small offices monitoring their network, and remote teams using Cloud.

Nmap suits network administrators who need host and service discovery, inventory, or uptime monitoring across supported systems.

Wireshark suits network professionals, security experts, developers, and educators who need to inspect captured traffic.

perfSONAR

perfSONAR suits science facilities, campuses, laboratories, network providers, exchange points, virtual organizations, researchers, and software or service developers.

Omnipeek suits enterprises and service providers needing continuous packet analysis and troubleshooting.

tcpdump suits users who need a command-line tool for network monitoring and packet capture.