The best File Manager alternative to Nextcloud is ownCloud, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Nextcloud and many of them are File Managers so hopefully you can find a suitable replacement. Other interesting File Manager alternatives to Nextcloud are Seafile, Pydio, Sync-in and Filestash.
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.
Pydio is the mature alternative to Dropbox and Box.com, to build your own box, on your own servers.
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.
A Dropbox-like file manager that let you manage your data anywhere it is located: FTP, SFTP, WebDAV, Git, S3, Minio, Dropbox, Google Drive.
Portable file server with accelerated resumable uploads, dedup, WebDAV, FTP, TFTP, zeroconf, media indexer, thumbnails++ all in one file, no deps.
Secure file sharing software with end-to-end encryption. Files are encrypted in-browser, and encryption keys are embedded in the URL, never sent to the server. This ensures file content remains private and inaccessible to third parties, including the software administrator and ISPs.
FileRun is a full featured PHP web based file manager with a very easy to use user interface.
Make your cloud storage beautiful. Playbook declutters, auto-tags, and intelligently organizes your creative work. Seamlessly browse, collaborate on, and share what you need with friends, colleagues, clients—or the whole world!
Keep your data secure and private, import files from other providers and sync on any of your devices.
FileAgo is a easy and highly secure self-hosted file storage and collaboration platform for companies and teams. Compared to other solutions, FileAgo is an attempt to tackle the collaboration part in a slightly different matter.
PicoDAV is a smaller subset to karadav, aimed at providing quick and easy access to files on a web server via WebDAV, specifically with mass hosting providers, who often only provide slow FTP access.
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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.