The original date given for release was mid-July.
The head of the company, Frank Karlitschek, announced the release on Twitter, saying he was happy to try and follow the Red Hat model and "do 100% open source".
Disagreement over the extent to which code should be released under open source licences was the main reason for Nextcloud to be set up as a fork from ownCloud; the latter had to shut its doors as a result as its US funding was pulled.
In a media release, the company said all enterprise functionality that users and customers needed would be available over coming weeks, fully developed in the open and under the AGPL licence.
Version 9 introduces write-only upload to Nextcloud. "Anonymous users can upload files in such a folder without being able to see or download other files already uploaded, while the owner of the folder gets the usual notification and can see all files which have been uploaded," it said. "This offers a fast and secure way to let multiple customers or friends share files with you in a single shared folder."
The release also includes enterprise-grade logging for activities like file sharing, updates, and user logins. "This enables admins to generate compliance reports or auditing information and they can feed the logs in enterprise tools and solutions like Splunk," the release added.
Nextcloud community manager Jos Poortvliet said: "We made a firm decision that our business model would not include any non-free components: Nextcloud will be
fully open source.
"There will be no open core business model. This means we will follow the successful business model pursued by Red Hat: sell services and support for a product for which you employ the foremost experts.
"We are confident that we are in the best position to offer the kind of support customers need to keep their critical deployments running."