Cicada is a application to monitoring network devices by ICMP (ping), SNMP v1/2c/3, Modbus TCP, IPMI, WMI and http/s (plain-text, json, xml). Cross-platform, open source, extendable, free.
site: http://little-brother.ru/en/cicada
Source: https://github.com/little-brother/cicada
Demo: http://91.77.161.142:5000