Nagios - Complete monitoring and alerting for servers, switches, applications, and services
Gitwin - Enable your Windows system as a powerful and secure Git repository. Supports ssh, http(s) transports. Gitweb with highlighter and gravatar support available.
Zenoss Core - Zenoss (Zenoss Core) is an open source application, server and network management platform based on...
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
System Center Operations Manager - System Center Operations Manager 2012 R2 uniquely enables customers to reduce the cost of data...