Objectives HermitCore is a novel unikernel operating system targeting a scalable and predictable runtime behavior for HPC and cloud environments. The current version supports C/C++, Fortran, Go, Pthreads, OpenMP and iRCCE as message passing library. The potential of HermitCore is illustrated by a small number of videos. Design HermitCore can be used as classical unikernel within a virtual machine.