Network Monitor Analyzer

1)Wireshark Network Protocol Analyzer-Network protocol analyzer for Windows and Unix that allows examination of data from a live network, or from a capture file on disk
download

2)Ethereal- A Network Protocol Analyzer
download

3)EtherApe is a graphical network monitor for Unix modeled after etherman.Featuring link layer, ip and TCP modes, it displays network activity graphically download

4)SNORT-SNORT is an Open Source Intrusion Detection System download

5)Argus-designed to monitor servers and network connections download

6)ngrep is a "network grep" utility that can be used to match regular expressions within network packet payloads download

7)Nagios for network and service monitoring download

8)NetworkActiv to sniff webpages on a Wi-Fi network download