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Open-Source Alternatives to Synology

Ranking updated Aug 19, 2026

For an open source alternative to Synology NAS, the first results are openmediavault/openmediavault (OpenMediaVault is a Debian-based NAS operating system that provides a browser-managed storage appliance with RAID, file sharing, user permissions, and a modular plugin ecosystem), owncloud/core (OwnCloud is a self-hosted cloud storage and file synchronization server with user management, sharing, and an extensible app ecosystem, matching the private cloud aspect of your search while lacking native storage pooling or RAID management) and opencloud-eu/opencloud (OpenCloud is a self-hosted file sync and share platform that handles file management and client synchronization, but it lacks the broader NAS features like storage pooling, RAID management, and a full container ecosystem). nextcloud/server and icewhaletech/casaos round out the shortlist. Compare the match explanations and check the project documentation against your requirements.

We curate open-source GitHub repositories matching “open source alternatives to synology”. Results are ranked by relevance to your query — pick filters below to narrow, or refine with AI.

Open-Source Alternatives to Synology

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  • openmediavault/openmediavaultopenmediavault avatar

    openmediavault/openmediavault

    6,802View on GitHub↗

    OpenMediaVault is a Debian-based network attached storage (NAS) operating system that turns a computer into a dedicated storage appliance, managed entirely through a browser-based control panel. It provides a unified configuration interface for managing file sharing protocols, RAID arrays, user permissions, and network services, with extensibility through a modular plugin system that adds new capabilities without modifying the core installation. The platform supports setup and management of multiple RAID levels for data redundancy or performance, and exposes file storage over protocols includ

    OpenMediaVault is a Debian-based NAS operating system that provides a browser-managed storage appliance with RAID, file sharing, user permissions, and a modular plugin ecosystem.

    PHPRAID Configurations
    View on GitHub↗6,802
  • owncloud/coreowncloud avatar

    owncloud/core

    8,793View on GitHub↗

    This project is a self-hosted cloud storage server and content collaboration platform implemented as a PHP web application framework. It functions as a centralized server for storing, synchronizing, and sharing files and data across multiple devices. The system operates as a WebDAV file server and a synchronization server for scheduling and contact information using CalDAV and CardDAV protocols. It features a plugin architecture that allows the server to be extended with additional applications and custom features. The platform provides capabilities for user and group access management, exte

    OwnCloud is a self-hosted cloud storage and file synchronization server with user management, sharing, and an extensible app ecosystem, matching the private cloud aspect of your search while lacking native storage pooling or RAID management.

    PHPFile SynchronizationWebDAV Implementations
    View on GitHub↗8,793
  • opencloud-eu/opencloudopencloud-eu avatar

    opencloud-eu/opencloud

    4,829View on GitHub↗

    OpenCloud is a self-hosted platform for synchronizing files across devices and sharing them with team members through collaborative spaces and access controls. It enables users to sync files between a server and local desktop and mobile clients, manage files and folders, and share content with internal and external contributors via permission-based links and file drops. The platform integrates an embedded OpenID Connect identity provider for authentication and supports external identity providers. It stores all data and metadata directly on the filesystem, eliminating the need for a separate

    OpenCloud is a self-hosted file sync and share platform that handles file management and client synchronization, but it lacks the broader NAS features like storage pooling, RAID management, and a full container ecosystem.

    GoFile Sync ClientsRole-Based Access Control
    View on GitHub↗4,829
  • nextcloud/servernextcloud avatar

    nextcloud/server

    35,797View on GitHub↗

    Nextcloud is a self-hosted platform designed for private cloud storage, file synchronization, and collaborative team workspaces. It provides a comprehensive suite of tools for document editing, groupware services like calendars and contacts, and secure data management, all while ensuring users maintain full control over their infrastructure and data sovereignty. The platform distinguishes itself through a decentralized federated architecture that allows independent server instances to securely share data and collaborate across a network. It features a highly modular plugin ecosystem, enabling

    Nextcloud is a self-hosted private cloud and file-sharing platform that delivers file synchronization, collaboration, and a rich app ecosystem, though it focuses more on cloud collaboration than low-level storage pooling and RAID management.

    PHPFile SynchronizationFile Sharing Management
    View on GitHub↗35,797
  • icewhaletech/casaosIceWhaleTech avatar

    IceWhaleTech/CasaOS

    34,091View on GitHub↗

    CasaOS is a lightweight software stack designed to transform standard Linux distributions into a comprehensive personal cloud platform. It functions as a management layer that sits atop the host operating system, providing a unified graphical dashboard to deploy, monitor, and administer containerized applications and local hardware resources. By automating the lifecycle of isolated software services, it enables users to maintain a private and secure digital infrastructure on their own hardware. The platform distinguishes itself through a declarative configuration model that continuously recon

    CasaOS provides a personal cloud dashboard and container management layer for self-hosted hardware, offering a strong app ecosystem and hardware monitoring, though it lacks some native NAS-specific features like built-in storage pooling and RAID.

    GoMedia Servers
    View on GitHub↗34,091
  • 9001/copyparty9001 avatar

    9001/copyparty

    45,236View on GitHub↗

    Copyparty is a self-hosted file server that provides a browser-based interface for managing, browsing, uploading, and downloading files. It utilizes a virtual file system abstraction to map diverse storage backends and network-attached devices into a unified directory structure, allowing for consistent file access across various storage environments. The platform functions as a cloud synchronization gateway, enabling automated data backups and transfers between local storage and remote cloud providers through integration with standard command-line tools. It also serves as a distributed storag

    Copyparty is a self-hosted file server and NAS frontend that provides browser-based file management, sharing, and synchronization, though it lacks built-in RAID and storage pooling features comparable to a full appliance operating system.

    PythonFile Sharing ServicesCloud Storage GatewaysCloud Storage Sync Tools
    View on GitHub↗45,236
  • freenas/freenasfreenas avatar

    freenas/freenas

    2,570View on GitHub↗

    TrueNAS CORE/Enterprise/SCALE Middleware Git Repository

    This repository provides the core middleware for TrueNAS, offering robust storage management, pooling, and backup capabilities well-suited for a self-hosted private cloud, though it focuses primarily on the underlying operating system rather than an all-in-one Synology-style application ecosystem.

    PythonDatabase and Storage ToolsMore to explore
    View on GitHub↗2,570
  • advplyr/audiobookshelfadvplyr avatar

    advplyr/audiobookshelf

    13,206View on GitHub↗

    Audiobookshelf is a self-hosted media server designed for the organization and streaming of personal audiobook and podcast collections. It functions as a digital library manager that provides centralized hosting, allowing users to stream audio content to various web and mobile clients while maintaining synchronized playback progress across all devices. The platform distinguishes itself through comprehensive library management and multi-user administration tools. It includes integrated metadata enrichment to automatically fetch cover art and descriptive information, alongside utilities for edi

    Audiobookshelf is a self-hosted media server focused specifically on audiobooks and podcasts rather than a general-purpose private cloud or NAS solution.

    JavaScriptMedia ServersAutomated Backup SystemsRole-Based Access Control Systems
    View on GitHub↗13,206
  • hsluoyz/casbinhsluoyz avatar

    hsluoyz/casbin

    20,189View on GitHub↗

    Casbin is an authorization library designed to manage application access control and permissions through a configurable model-based engine. It serves as a centralized system for verifying whether a user has permission to perform specific actions on a resource. The engine supports multiple access control models, including Role-Based Access Control, Attribute-Based Access Control, and Access Control Lists. It allows for the definition of role hierarchies and the evaluation of user, resource, and environment attributes to make access decisions. The library decouples authorization logic from dat

    This repository is a programmatic authorization library rather than a complete self-hosted private cloud or network-attached storage solution.

    GoAccess ControlRole-Based Access ControlRole-Based Access Management
    View on GitHub↗20,189
  • causefx/organizrcausefx avatar

    causefx/Organizr

    5,693View on GitHub↗

    Organizr is a self-hosted service dashboard that aggregates links to all of your self-hosted applications into a single landing page for quick access. It functions as a unified tab manager, loading multiple services as individual tabs within one webpage to consolidate browser tabs and reduce clutter. The project provides role-based access control, restricting dashboard visibility and service links based on user authentication and permissions. It includes an external authentication gateway that validates credentials through Plex, Emby, LDAP, or sFTP, and a user management backend for creating,

    Organizr is a service dashboard for aggregating self-hosted application links rather than network-attached storage or private cloud software for file management and backup.

    PHPUser ManagementRole-Based Access Control
    View on GitHub↗5,693
  • jellyfin/jellyfinjellyfin avatar

    jellyfin/jellyfin

    53,338View on GitHub↗

    Jellyfin is a self-hosted media server that organizes digital media collections and streams content to various client devices over a local or remote network. It utilizes a client-server architecture that separates media processing and storage from user interfaces, communicating through a standardized web-based application programming interface. The platform is designed for cross-platform hosting, running consistently across Linux, Windows, and macOS through native binaries or containerized environments. It features a hardware-accelerated transcoding engine that offloads intensive video conver

    Jellyfin is a self-hosted media server focused on streaming and organizing digital collections rather than providing comprehensive network-attached storage, file management, or storage pooling.

    C#Media Servers
    View on GitHub↗53,338
  • seerr-team/seerrseerr-team avatar

    seerr-team/seerr

    11,663View on GitHub↗

    Seerr is a self-hosted media request system and automation orchestrator. It provides a web interface for users to search for and request movies and television shows for a home media server, acting as a coordinator between users, media servers, and automation tools to trigger the download and organization of approved content. The system distinguishes itself through a comprehensive request management layer that includes granular, role-based permissions and custom override rules to filter and modify incoming requests. It also features a dedicated notification engine that dispatches real-time sta

    Seerr is a media request management and automation tool rather than a comprehensive network-attached storage and private cloud system, making it an adjacent companion for home media servers rather than a full NAS replacement.

    TypeScriptMedia ServersRole-Based Access Control
    View on GitHub↗11,663
Compare the top 10 at a glance
RepositoryStarsLanguageLicenseLast push
openmediavault/openmediavault6.8KPHPNOASSERTIONJun 22, 2026
owncloud/core8.8KPHPAGPL-3.0Jun 16, 2026
opencloud-eu/opencloud
4.8K
Go
apache-2.0
Feb 21, 2026
nextcloud/server35.8KPHPAGPL-3.0Jun 16, 2026
icewhaletech/casaos34.1KGoApache-2.0Aug 6, 2025
9001/copyparty45.2KPythonMITJun 13, 2026
freenas/freenas2.6KPythonLGPL-3.0Jun 17, 2026
advplyr/audiobookshelf13.2KJavaScriptGPL-3.0Jun 4, 2026
hsluoyz/casbin20.2KGoApache-2.0Jun 16, 2026
causefx/organizr5.7KPHPgpl-3.0Jan 12, 2026

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