Cisco's network management product.

A tool to monitor the traffic load on network-links. Raw data collected via SNMP.

Sun Network Management

for centrally monitoring the performance and availability of distributed Windows NT systems and server applications such as Microsoft Exchange, SQL Server, IIS, Lotus Domino, Citrix WinFrame/MetaFrame and Oracle.

Commercial network monitors and analyzers for mac and windows.

Windows Syslog Daemon: receives, filters, logs, displays and forwards Syslog messages and SNMP traps. Freeware and service versions available.

A Unix tool that shows the network usage, similar to what the popular top Unix command does.

Source for tcpdump, libpcap, and traceroute.

Organization dedicated to operations systems support (OSS) communication management issues.

Benchmark tool that can be used to measure the performance of many different types of networking