There are lots of discussions, talks, white-papers and books available about DevOps which coalesce around delivering software faster, more often and reliably, breaking down walls between development and operations.
Kubernetes and Terraform are two well known foundational open source instruments for building infrastructure. They are very different by nature and application scenarios but also have lots similarities and intersections.
Jenkins X has become one of the most noticed recent open source announcements in 2018.
Is It Just a New Hype Tool?
What Is so Special About Running Jenkins in Containers?