The best open source File Sync alternative to Nextcloud is ownCloud. If that doesn't suit you, our users have ranked more than 100 alternatives to Nextcloud and many of them are open source File Sync Tools so hopefully you can find a suitable replacement. Other interesting open source File Sync Tool alternatives to Nextcloud are Seafile, Filen, Proton Drive and Pydio.
Self-hosted option for secure file sync, sharing, calendars, contacts, and mail supporting mobile, desktop, web access and external storage, real-time collaboration, password-protected links, document editing, anti-virus scanning, and LDAP integration.
Open source cloud platform for organizations with self-hosting, device file synchronization, sharing, versioning, secure encrypted storage, admin controls, web access, audit logging, and support for desktop and mobile clients for secure collaboration.
Filen is a cutting-edge cloud storage provider that offers client-side, end-to-end, zero-knowledge encryption. Headquartered and operated entirely in Germany, Filen is at the forefront of combining comprehensive features with uncompromising privacy and security.
Offering comprehensive privacy with end-to-end encryption, Proton Drive allows users to store, synchronize, and share files across various devices through web, desktop, and mobile apps. Free storage up to 5 GB, service remains open-source and audited, ensuring file content and access control.
Pydio is the mature alternative to Dropbox and Box.com, to build your own box, on your own servers.
kDrive is a Swiss online storage service that respects its users' privacy and makes storing, sharing & collaborating on files a breeze.
Sync-in is a secure, open-source platform for file storage, synchronization, and team collaboration — designed to give organizations full control over their data and workflows, while remaining flexible enough for individual needs.
Puter is a privacy-first personal cloud that houses all your files, apps, and games in one private and secure place, accessible from anywhere at any time.
A Dropbox-like file manager that let you manage your data anywhere it is located: FTP, SFTP, WebDAV, Git, S3, Minio, Dropbox, Google Drive.
Lightweight file storage with a Rust backend and optimized binary for efficiency, offering responsive UI on desktop and mobile, simple setup, multilingual English and Spanish support, no PHP dependency, and designed for minimal resource use on home servers.
Open-source cloud storage solution built on TypeScript, Deno, and Fresh, offering a minimal, user-friendly interface, WebDAV file access, easy sharing, modular architecture, and integration with existing clients, designed for privacy and flexible self-hosting.
Peergos is a secure and private online space where you can store, share and view your photos, videos, music and documents.
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For those who prefer FOSS, Nextcloud is the way to go. ownCloud is partially proprietary so they have a different philosophy.