Multiple Interface Watcher 

Multiple Interface Watcher (MIW) is a graph utility that shows the utilisation of up to 20 different network interfaces. The interfaces are defined in a file which is read by MIW. The data is requested using SNMP and percentage value are calculated.
multiple interface watcher miw.exe snmp network monitoring network utilisation

Interface Traffic Indicator 

Interface Traffic Indicator, a graph utility to measure incoming and outgoing traffic on an interface in bits/sec, bytes/sec or utilization. Works on all SNMP-capable interfaces (computers, NICs, switches, routers, etc) with adjustable poll interval.
interface traffic monitoring snmp mib in and out utilization bits/sec bytes/sec nic incoming outgoing