Nextcloud

Nextcloud is a suite of client-server software for creating and using file hosting services. Nextcloud provides functionality similar to Dropbox, Office 365, or Google Drive when used with integrated office suites Collabora Online or OnlyOffice. It can be hosted in the cloud or on-premises. It is scalable, from home office software based on the low cost Raspberry Pi, all the way through to full sized data centers that support millions of users. Translations in 60 languages exist for web interface and client applications. Read more on Wikipedia