Popular network and service monitoring solution and reporting platform
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SQL powered operating system instrumentation, monitoring, and analytics.
Open source load testing tool in which you can define user behaviour with Python code and swarm your system with millions of simultaneous users
Free and feature-rich networking monitoring system supporting multiple configurations, a variety of alerting mechanisms (email, XMPP, SMS), and numerous data collection methods (SNMP, HTTP, JDBC, etc)
Mature, enterprise-level platform to monitor large-scale IT environments