7 Best Open Source Alternatives to Nextcloud

7 open source alternatives100% OSI-approved licensesUpdated June 2026

Looking to replace Nextcloud? These open source alternatives give you the same core workflow without the lock-in - free to use, often self-hostable, and auditable on GitHub. Compare licenses, languages and project activity, then switch on your own terms.

Immich logo

1.Immich

103.3kAGPL-3.0TypeScript Self-host
Immich screenshot

Immich is a high-performance, self-hosted photo and video management solution that keeps your entire library on your own server. It is built to back up, organize, browse, and search photos and videos without handing your memories to a third-party cloud.

  • Automatic mobile backup for photos and videos
  • Search by metadata, objects, faces, and CLIP
  • Facial recognition and clustering
  • Shared albums and multi-user support
Syncthing logo

2.Syncthing

85.3kMPL-2.0Go Self-host
Syncthing screenshot

Syncthing is a continuous file synchronization program that keeps files in sync between two or more computers in real time. It is decentralized by design: there is no central server that might be compromised, and none of your data is ever stored anywhere other than on your own devices.

  • Continuous, real-time sync across two or more devices
  • Decentralized with no central server
  • TLS-encrypted transfers with perfect forward secrecy
  • Devices authenticated by cryptographic certificates
Copyparty logo

3.Copyparty

45.2kMITPython Self-host
Copyparty screenshot

Copyparty is a portable file server that turns almost any device into a place to share files over a local network or the internet, with resumable uploads and downloads from any web browser. Access is controlled with per-folder and per-user permissions plus temporary share links.

  • Resumable uploads and downloads in a web browser
  • HTTP, WebDAV, SFTP, FTP, TFTP, and SMB/CIFS access
  • File deduplication and file indexing
  • Thumbnails, search, RSS feeds, and OPDS feeds
CasaOS logo

4.CasaOS

34.1kApache-2.0Go Self-host
CasaOS screenshot

CasaOS is a personal cloud system that runs on home servers and turns spare hardware into a place to store and manage your own data, apps, and smart devices. It originated as the pre-installed system for the ZimaBoard.

  • Home-focused web UI for no-code operation
  • App store with one-click installs for selected apps
  • Docker app installation from the container ecosystem
  • Drive and file management
Radicale logo

5.Radicale

4.7kGPL-3.0Python Self-host
Radicale screenshot

Radicale is a small CalDAV and CardDAV server for sharing calendars, to-do lists, and contact lists. It supports events, todos, journal entries, and business cards, and exposes them through CalDAV, CardDAV, and HTTP.

  • Shares calendars and contact lists through CalDAV, CardDAV, and HTTP
  • Supports events, todos, journal entries, and business cards
  • Stores data on the file system in a simple folder structure
  • Can limit access by authentication and secure connections with TLS
Twake logo

6.Twake

1.9kAGPL-3.0TypeScript Self-host
Twake screenshot

Twake is a secure open source collaboration platform built to improve how organizations work together. It brings team chat, file storage, a shared team calendar, task management, video calls, and real-time document collaboration into a single digital workplace.

  • Team chat for everyday communication
  • File storage for shared documents
  • Shared team calendar and task management
  • Video calls and conferencing
Rockstor logo

7.Rockstor

606GPL-3.0Python Self-host
Rockstor screenshot

Rockstor is a network attached storage solution built on Linux and the BTRFS filesystem. It ships as a complete Linux distribution and runs as a DIY appliance on commodity PC, Pi 4, and ARM64 hardware.

  • Linux and BTRFS based NAS storage
  • Advanced storage management web UI
  • Optional Rock-ons Docker app subsystem
  • RESTful APIs for management

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