CloudNativePG is the Kubernetes operator that covers the full lifecycle of a highly available PostgreSQL database cluster with a primary/standby architecture, using native streaming replication.
Strimzi provides a way to run an Apache Kafka cluster on Kubernetes in various deployment configurations.
Production ready management for File, Block and Object Storage
An Ansible AWX operator for Kubernetes built with Operator SDK and Ansible.
Flux is a tool that automatically ensures that the state of a cluster matches the config in git. It uses an operator in the cluster to trigger deployments inside Kubernetes, which means you don't need a separate CD tool. It monitors all relevant image repositories, detects new images, triggers deployments and updates the desired running configuration based on that (and a configurable policy).
The benefits are: you don't need to grant your CI access to the cluster, every change is atomic and transactional, git has your audit log. Each transaction either fails or succeeds cleanly. You're entirely code centric and don't need new infrastructure.