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Since you're focusing on server-side applications, you might be interested in Mirage OS. It's a project that constructs minimal application-specific VMs constructed using OCaml. Haven't used it but I believe the idea is you write your service in OCaml, test it on a normal system, and when you're done it will build a minimal VM image that has the minimal amount of OS required to host and run the service. You then manage it with xen or kvm.
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Hence, a higher number means a more popular project.