Cloud Native Computing Foundation (CNCF) is the open source, vendor-neutral hub of cloud native computing, hosting projects like Kubernetes and Prometheus to make cloud native universal and sustainable.
CNCF manages different projects which extends the Kubernetes solution to provide more features. Here’s some of the projects:
CRI-O - A Kubernetes container runtime that manages the containers.
CNI - pluggable common network interface
Jaeger - an operator for packaging, deploying, and managing applications
Rook - a storage orchestrator for Kubernetes
Each of these projects will have different statuses as defined by CNCF.
You can read about their organizations and the projects that they maintain here.