Fluentd - Fluentd is a cross platform open source data collection solution originally developed at Treasure Data.
The Dude - MikroTik is a Latvian company which was founded in 1996 to develop routers and wireless ISP systems. MikroTik now provides hardware and software for Internet connectivity in most of the countries around the world.
Splunk - Splunk's operational intelligence platform helps unearth intelligent insights from machine data.
Pandora FMS - Pandora FMS: Opensource monitoring software
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.
OpenNMS - Project home page of OpenNMS - a java based network managememnt platform developed under the Open Source model