Nextcloud

The most popular self-hosted cloud platform for file storage, collaboration, and communication.

Open source alternative to:

Nextcloud is the world's most popular open-source, self-hosted cloud platform. It started as a file sync and share solution (like Dropbox or Google Drive) and has evolved into a comprehensive productivity suite with files, calendar, contacts, email, talk (video/chat), and hundreds of apps available through the Nextcloud App Store.

Nextcloud Files provides desktop sync clients for Windows, macOS, and Linux, as well as mobile apps for iOS and Android. Files can be shared with granular permissions, encrypted, and version-controlled. The platform integrates with ONLYOFFICE and Collabora Online for in-browser document editing, effectively replicating the full Google Workspace experience on your own infrastructure.

With over 34,000 GitHub stars and licensed under AGPL-3.0, Nextcloud is the gold standard for self-hosted cloud storage. It is deployable on any Linux server, available as a one-click install via Docker, and maintained by Nextcloud GmbH with an active enterprise support offering. For organizations wanting to replace Google Drive and the broader Google Workspace, Nextcloud is the most complete solution.