Icinga is an open source monitoring system that checks the availability of resources and notifies users of outages. It was originally forked from Nagios in 2009. Icinga 2 is the latest version released in 2014 and is written in C++. Icinga 2 can monitor hosts, services, databases, and other resources and generate alerts through email, SMS, voice, and tickets. It also provides reports on monitoring data. Icinga Web 2 is a new web interface that is lightweight, flexible, and supports multiple backends including Icinga 1 and 2. The Icinga community includes many users and holds user conferences called Icinga Camps to bring people together.