IncludeOS is a minimal unikernel operating system for C++ services. Instead of running on a general-purpose operating system, the operating system functionality is linked into the application at build time, so the application runs as a lean virtual machine. According to the project, applications start in tens of milliseconds and need only a few megabytes of disk and memory. It runs under full virtualisation on x86 hardware, with KVM, VirtualBox and VMware support. The project states that its public API is not yet stable.
IncludeOS is open source under the Apache-2.0 licence and is developed in public on GitHub, where commits continued in 2026; the website names Alfred Bratterud as maintainer. Wikipedia lists IncludeOS AS, a Norwegian company form, as developer. It is not a hosted service: you build the unikernel and run it on your own infrastructure or at a provider of your choice, so the location of data depends on where those virtual machines run.