OperatorFabric is a modular, extensible, industrial-strength platform for alarming and coordination processes.
PowSyBl is a an open-source set of Power System Blocks dedicated to grid analysis, visualization, and simulation.
Ceph is a scalable, open-source storage platform that provides unified object, block, and file storage.
The Linux kernel is an open-source core that manages hardware and system resources for Unix-like operating systems.