Now that the Open Container Initiative (OCI) has promised to make all containers one, has work on container technologies other than Docker come to a halt? Short answer: No. In CoreOS’s case, development has only accelerated.
CoreOS, which makes an alternate container system that uses many of Docker’s ideas, has been hard at work on its Rocket container runtime. Pitched as a way to deal with containers where security and simplicity are the leading concerns, Rocket (aka rkt), now at version 0.8, brings with it Intel-engineered features that CoreOS claims are not found in other container runtimes.