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.
ServerSuit - ServerSuit is a browser based program that enables remote Linux administration, monitoring, website hosting, and server setup automation.
ClearFlask - Open-source Product Feedback Tool with a Public Roadmap and Announcements.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services