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.
iStat Menus - "An advanced Mac system monitor for your menubar."
Pandora FMS - Pandora FMS: Opensource monitoring software
iStatistica Pro - System monitor. Reinvented. 💻 🖥
OpenNMS - Project home page of OpenNMS - a java based network managememnt platform developed under the Open Source model
Stats - Simple macOS system monitor in your menu bar.