The Open Container Initiative (OCI) is a Linux Foundation project, started in June 2015 by Docker, CoreOS, and the maintainers of appc (short for "App Container") to design open standards for operating system-level virtualization (containers).
[1][2][3] At launch, OCI was focused on Linux containers and subsequent work has extended it to other operating systems.
The OCI organization includes the development of runc, which is the reference implementation of the runtime-spec,[7][8] a container runtime that implements their specification and serves as a basis for other higher-level tools.
[11] The image-spec is a software shipping container image format spec (OCI Image Format) that reached version 1.0.0 on July 19, 2017.
The distribution-spec was created on March 8, 2018 from a Proposal for a JSON Registry API V2.1.