CRIU

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Checkpoint/Restore In Userspace, or CRIU (pronounced kree-oo, IPA: /krɪʊ/, Russian: криу), is a software tool for Linux operating system. Using this tool, you can freeze a running application (or part of it) and checkpoint it to a hard drive as a collection of files. You can then use the files to restore and run the application from the point it was frozen at. The distinctive feature of the CRIU project is that it is mainly implemented in user space.

https://criu.org

Musl-libc

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musl is a C standard library intended for operating systems based on the Linux kernel, released under the MIT License.

https://www.musl-libc.org/

P.Haul

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Process HAULer -- a tool to live-migrate containers and processes

https://criu.org