Open Source Alternatives LogoOpen Source Alternatives
AlternativesBlogAdvertise
Open Source Alternatives LogoOpen Source Alternatives

Stay Updated

Subscribe to our newsletter for the latest news and updates about Alternatives

Open Source Alternatives LogoOpen Source Alternatives

Handpicked Open Source Alternatives to Paid Softwares

Product
  • Search
  • Categories
  • Tag
  • Sign In
Resources
  • Blog
  • Collection
  • Submit
  • Advertise your tool
Company
  • Privacy Policy
  • Terms of Service
  • Refund Policy
  • Sitemap
Copyright © 2026 All Rights Reserved.
Home/Categories/Cloud & Hosting/OpenCloud
icon of OpenCloud

OpenCloud

Open source alternative to Microsoft 365, Google Workspace and Box

OpenCloud is an open source file sync and sharing platform for organizations that need data sovereignty: self-hosted, S3-compatible storage, and a modern web collaboration interface. Apache-2.0 licensed.

5.6K starsGoApache-2.0Active this week
Visit websiteGitHub repo
image of OpenCloud
Contents
  1. 01Who OpenCloud is for
  2. 02The problem it solves
  3. 03How it solves it
  4. 04Strengths and trade-offs
  5. 05Tech stack
  6. 06FAQ
  7. 07Similar open-source tools
TL;DR

OpenCloud is a file-sync and collaboration server backend for organizations that want cloud storage under their own control. It replaces proprietary file platforms like Google Drive or Microsoft OneDrive when data location, identity integration, and self-hosting matter. Apache-2.0 licensed.Apache-2.0 · Go · 5.6K stars · Active this week

who it's for

Who OpenCloud is for#

Organizations needing sovereign file storage

Use OpenCloud when file sharing and sync need to run on infrastructure controlled by the organization or jurisdiction.

Skip if:

You only need consumer-grade cloud storage with no server operations.

Platform teams integrating storage with identity

Use OpenCloud when file access must connect to OpenID Connect identity providers and internal policy.

Skip if:

Your team cannot operate a file service and identity integration stack.

the problem

The problem it solves#

File collaboration often starts with convenience and ends with platform lock-in. Documents, user identity, sharing links, and access policy become tied to a vendor account that may not fit sovereignty, public-sector, or regulated requirements.

Teams need modern file access and sharing without surrendering the storage layer. The hard part is combining identity, filesystem storage, web access, and collaboration semantics into a server that operators can run and audit.

how OpenCloud solves it

How it solves it#

Self-hosted file backend

OpenCloud provides the server backend for file storage and sharing, giving operators a way to keep data on controlled infrastructure.

OpenID Connect authentication

The README documents authentication through OpenID Connect with external identity providers such as Keycloak or the embedded LibreGraph Connect provider.

Filesystem-based storage

The project README states that the backend stores data in the filesystem by default rather than relying on a separate database.

strengths · trade-offs

Strengths and trade-offs#

Strengths

  • Apache-2.0 server codeOpenCloud publishes the server backend under Apache-2.0, which gives teams a permissive basis for review, modification, and deployment.
  • Identity integration is built into the backend modelOpenID Connect support helps organizations connect file collaboration to existing identity policy instead of operating isolated local accounts.

Trade-offs

  • -Backend-focused project surfaceThe main repository describes the server backend. Teams should review the wider OpenCloud ecosystem and docs before assuming every end-user collaboration feature is included in this repo.
tech stack · detected from GitHub

What it's built on#

Languages
GoJavaScriptPHP
Frameworks
React
Tooling
Webpack
frequently asked

FAQ#

What is OpenCloud?

OpenCloud is a server backend for self-hosted file storage, sync, and collaboration workflows.

How does OpenCloud authenticate users?

The README documents OpenID Connect authentication through external providers such as Keycloak or the embedded LibreGraph Connect provider.

Does OpenCloud use a database?

The README states that the backend stores data in the filesystem by default and does not use a database for that storage layer.

also worth a look

Similar open-source tools#

Galae Email

Galae Email

Self-hosted email server stack forked from Mailcow

6JavaScriptGPL-3.0
LibreOffice

LibreOffice

Free office suite with Writer, Calc, and Impress on any platform

3.9KC++GPL-3.0
Drivebase

Drivebase

Self-hosted cloud file manager with unified storage

202TypeScriptMIT
Mattermost

Mattermost

Team messaging for security-sensitive teams with air-gap support

36.7KTypeScript
PeerTube

PeerTube

Federated video hosting you own, with no YouTube dependency

14.7KTypeScriptAGPL-3.0
Jitsi

Jitsi

Free video conferencing you can self-host with no account needed

29.2KTypeScriptApache-2.0

Repository

Stars
5.6K
Forks
207
License
Apache-2.0
Latest
v7.1.0
Last commit
4 days ago
Last verified
Jun 6, 2026
Repo
opencloud-eu/opencloud ↗

Additional details

Language
Go
Open issues
346
Contributors
144
First release
2025

Categories

Cloud & HostingCommunication & CollaborationIT Management

Tags

File Sync & StorageFile SharingSelf HostedCloud NativeCloud ManagementSecurityDocumentation