CoreOS is an open-source lightweight operating system based on the Linux kernel and designed for providing infrastructure to clustered deployments, while focusing on automation, ease. Developed by CoreOS, Inc
License: Free
CoreOS is designed primarily for containerized applications and has a minimal footprint, while CentOS is a general-purpose server OS with a rich ecosystem and robust support for traditional applications. CoreOS focuses on automation and orchestration, whereas CentOS offers stability and compatibility with a larger variety of software.