Fortigate is one of the most popular NGFW (Next Generation Firewalls)
This project's main purpose is to create an open-source log monitoring platform dedicated for Fortigate based on this firewall's logs.
It is based on ELK, which stands for ElasticSearch, Logstash and Kibana.
This should be considered as a free alternative to FortiAnalyzer from a functional point of view.
For more details about this plugin : https://github.com/Zen-Networks/forti-elk