ServerSuit - ServerSuit is a browser based program that enables remote Linux administration, monitoring, website hosting, and server setup automation.
Flagsmith - Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.
AppZero - AppZero is a monitoring and migration tool that allows users to keep track of different applications and servers in both simple and complex IT environments.
ClearFlask - Open-source Product Feedback Tool with a Public Roadmap and Announcements.
CULA - A webmonitoring solution for beginners and pros.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services