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.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Pandora FMS - Pandora FMS: Opensource monitoring software
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
OpenNMS - Project home page of OpenNMS - a java based network managememnt platform developed under the Open Source model
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.