mrtg

LoriotPro freeware is a Windows-based graphical snmp manager that provides access to snmp devices, and allows analysis of snmp requests, executing snmp get and set requests, and compiling mib.

ByteMon offers real-time network monitoring with SNMP, WMI, and packet filtering functionalities. It provides administrators with a comprehensive view of the network and server status, along with detailed historical data and charts. It's an MRTG-like solution.