System Center Operations Manager - System Center Operations Manager 2012 R2 uniquely enables customers to reduce the cost of data...
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.
Opsview Atom - Monitor everything. Integrate anything. Scale anywhere.
LANState - LANState - Network Mapper and Device Monitor
Shinken - Nagios compatible monitoring framework, written in Python