1)   AdventNet SNMP API - Free Edition 4
AdventNet SNMP API offers a comprehensive toolkit for SNMP-based network management applications. AdventNet's SNMP stack comprises a set of powerful Java SNMP library to build real-time applications for monitoring and tracking network elements.
SNMP, Network Management, SNMP Trap, SNMP V1, SNMP V2C, SNMP V3, SNMP Proxy, SNMP Forwarding, Agent, SNMP API,

 2)   Adventnet SNMP Utilities 4
AdventNet SNMP Utilities offers a comprehensive toolkit for SNMP-based network management applications. These tools can be used for device, element, application, and system management. Also it is very helpful for debugging and testing.
SNMP, Network Management, SNMP Trap, SNMP V1, SNMP V2C, SNMP V3, SNMP Proxy, SNMP Forwarding, Agent, SNMP API,