Nanos is described as 'New kernel designed to run one and only one application in a virtualized environment. It has several constraints on it compared to a general purpose operating system such as Windows or Linux - namely it's a single process system with no support for running' and is a operating system in the os & utilities category. There are more than 10 alternatives to Nanos for a variety of platforms, including Linux, BSD, Self-Hosted, Mac and Windows apps. The best Nanos alternative is Linux kernel, which is both free and Open Source. Other great apps like Nanos are FreeBSD, OpenBSD, Linux-libre and GNU Hurd.