The Apache Project Management Committee has decided to put the Mesos project in the attic, a place where projects are archived that are no longer actively developed. Mesos is a collection of software that puts an abstraction layer on a cluster of machines for running distributed applications. In many respects it was a competitor to Kubernetes although it lacked some components such as a scheduler that users had to bring in from other projects.
After losing ground to Kubernetes the Mesosphere startup who sold a commercial version of Mesos called DC/OS pivoted to Kubernetes as well, renaming themselves to D2iQ.