RustyHermit is a unikernel targeting a scalable and predictable runtime for high-performance and cloud computing. Unikernel means, you bundle your application directly with the kernel library, so that it can run without any installed operating system. This reduces overhead, therefore, interesting applications include virtual machines and high-performance computing.
The kernel is able to run Rust applications, as well as C/C++/Go/Fortran applications.
Exactly as it says on the tin.