XR SNMP Tools 

XR SNMP Tools monitors network traffic and bandwidth usage as well as many other network parameters like error and collision rates, memory and CPU usage. It provides valuable info for system administrators. OPC server is available in other versions.
snmp opc network monitoring rpm

XR PerfMon Tools 

XR PerfMon Tools remotely monitors MS Windows computers using WMI technology, providing valuable information for system administrators to optimize the efficiency and setup of servers and workstations. OPC server is available in other versions.
perfmon wmi opc server monitoring workstation monitoring computer performance monitoring rpm