Apps similar to SNMP .NET include Net-SNMP, which is free and open source. Other options are OpenSNMP, SNMP Data Logger and SNMP#NET. In total there are four Network Monitors like SNMP .NET for Windows, Linux and Mac.
Net-SNMP provides tools and libraries relating to the Simple Network Management Protocol including: An extensible agent, an SNMP library, tools to request or set information from SNMP agents, tools to generate and handle SNMP traps, etc.
openSNMP is a multi-threaded SNMPv3 engine. This project supports the Simple Network Management Protocol version 3. In particular, it is designed to match the architecture of the Internet Engineering Task Force SNMPv3 standard (RFCs 3410-15).
SNMP Data Logger retrieves and logs values in real time from various SNMP agents to a file, any database or Excel
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SNMP#NET Simple Network Management Protocol (SNMP) .Net library written in C# (csharp). Implements protocol version 1, 2 and 3.
