NetBeans is in the process of being released as a project governed by the Apache Software Foundation.
What needs to happen before NetBeans is released?
Read all about it here, join in, and participate:
https://cwiki.apache.org/confluence/display/NETBEANS/List+of+Modules+to+Review
Important Links:
https://jaxenter.com/netbeans/using-apache-netbeans-incubating-jdk-9
https://blogs.apache.org/netbeans/