Nextcloud

Nextcloud

Privacy-focused organizations and teams that need a self-hosted alternative to Google Workspace or Dropbox with file sync, document editing, and collaboration built in

Cloud Storage ★★★★☆ 4.2/5 Free self-hosted (Enterprise from EUR 36/user/yr) Visit Website

Pros

  • Complete Google Workspace replacement with file sync, Nextcloud Office (based on Collabora), Talk for video calls, calendar, contacts, and email integration in one self-hosted platform
  • End-to-end encryption option ensures files are encrypted client-side before upload, so even server administrators cannot read the contents
  • Desktop and mobile sync clients for Windows, macOS, Linux, Android, and iOS provide seamless file access with selective sync and virtual file support
  • App Store with 400+ extensions adds project management (Deck), note-taking, forms, password management, and integration with tools like OnlyOffice, Outlook, and Thunderbird
  • Federation protocol allows separate Nextcloud instances to share files and calendars across organizations without centralizing data on a single server

Cons

  • Performance degrades noticeably with 10,000+ files in a single folder; large deployments require careful tuning of PHP memory limits, OPcache, and Redis caching
  • Built-in office suite (Collabora-based) has noticeable formatting differences when editing complex Excel spreadsheets or PowerPoint files compared to Microsoft 365
  • No native email server — you need to run a separate mail server like Postfix or connect to an existing IMAP/SMTP provider for email functionality
  • Upgrade process between major versions occasionally breaks third-party apps, requiring you to wait for app developers to release compatible updates

Key Features

  • File sync and share with version history, conflict resolution, and trash bin recovery
  • Nextcloud Office for collaborative document editing in the browser (based on Collabora Online)
  • Nextcloud Talk for video conferencing, screen sharing, and persistent chat rooms
  • Calendar and contacts with CalDAV/CardDAV sync to mobile devices and desktop clients
  • Nextcloud Deck for Kanban-style project management boards
  • Two-factor authentication, brute-force protection, and audit logging for security compliance
  • LDAP/Active Directory integration with group mapping and quota management