Bear Mountain Software
   BMS's TOPPER network and email management tool performs real-time monitoring, alerting, and reporting for NT and Unix-based systems.
   http://www.bearmtnsw.com

ByteSphere's OiDView
   A modular, expert system for SNMP agent analysis in details.
   http://www.oidview.com/oidview.html

CMU SNMP Library
   The CMU SNMP library provides developers with a set of core functions.
   http://www.net.cmu.edu/groups/netdev/software.html

Fusion SNMP - v1, v2, and V3 Source Code
   Provides a complete protocol stack and run-time environment required to support an SNMP agent within an embedded system.
   http://www.dspos.com/DSPOSWeb/network_mgmt/fusion_snmp.htm

Future SNMPv2c
   Complete implementation of the bi-lingual agent from SNMPv1 and SNMPv2c network management protocols.
   http://www.futsoft.com/snmp.htm

SNMPv1,v2c,v3 java libraries
   The iReasoning SNMP library provides a high performance, cross platform Java API for building network management applications based on SNMP. All SNMP versions (SNMPv1, SNMPv2c and SNMPv3) are fully supported. It is written in Java, and has been designed f
   http://www.ireasoning.com

The UCD-SNMP Project
   Various SNMP tools, including an extensible agent, a library, tools to request or set information from SNMP agents, tools to generate and handle SNMP traps, a version of the unix 'netstat' command using SNMP a Tk/perl mib browser. Based on the CMU SNMP im
   http://www.ece.ucdavis.edu/ucd-snmp/