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.
SNARLsnmp is a web application monitor for net-snmp 5.0.3 and higher. it actively monitors performance, content, some logic and is capable to even monitor complex web transactions with highly dynamic URLs and many other features