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Simple Network Management Protocol (SNMP) is a widely used protocol for monitoring the health and welfare of network equipment (eg. routers), computer equipment and even devices like UPSs. Net-SNMP is a suite of applications used to implement SNMP v1, SNMP v2c and SNMP v3 using both IPv4 and IPv6. The suite includes:

Command-line applications to:
retrieve information from an SNMP-capable device, either using single requests (snmpget, snmpgetnext), or multiple requests (snmpwalk, snmptable, snmpdelta).
manipulate configuration information on an SNMP-capable device (snmpset).
retrieve a fixed collection of information from an SNMP-capable device (snmpdf, snmpnetstat, snmpstatus).
convert between numerical and textual forms of MIB OIDs, and display MIB content and structure (snmptranslate).
A graphical MIB browser (tkmib), using Tk/perl.
A daemon application for receiving SNMP notifications (snmptrapd). Selected notifications can be logged (to syslog, the NT Event Log, or a plain text file), forwarded to another SNMP management system, or passed to an external application.
An extensible agent for responding to SNMP queries for management information (snmpd). This includes built-in support for a wide range of MIB information modules, and can be extended using dynamically loaded modules, external scripts and commands, and both the SNMP multiplexing (SMUX) and Agent Extensibility (AgentX) protocols.
A library for developing new SNMP applications, with both C and perl APIs.

Net-SNMP is available for many Unix and Unix-like operating systems and also for Microsoft Windows. Note: Functionality can vary depending on the operating system. Please see the README files for information specific to your platform.