Nextcloud is described as 'On-premises file sync, universal access, integrated collaboration, real-time communication with privacy and data control focus' and is a leading Cloud Storage service in the office & productivity category. There are more than 100 alternatives to Nextcloud for a variety of platforms, including Web-based, Windows, Android, iPhone and Linux apps. The best Nextcloud alternative is ownCloud, which is both free and Open Source. Other great apps like Nextcloud are Dropbox, Google Drive, MEGA and Seafile.
Librevault is an open-source peer-to-peer file synchronization program, designed with convenience and privacy in mind. Our goal is to make a better alternative to BitTorrent Sync and Syncthing.
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.
Syncany is an open-source cloud storage and filesharing application. It allows users to backup and share certain folders of their workstations using any kind of storage, e.g. FTP, Amazon S3 or Google Storage.
FileCloud is a hyper-secure, content collaboration platform (CCP) enabling powerful file sharing and compliance for millions of users.
Kiteworks Secure File Sharing is a software offering a platform for secure collaboration, virtual data rooms, managed file transfer, and SFTP.
e2ee-cloud is a open source, self-hosted, end-to-end encryption software. You can upload and download files in your browser. All files and folders will be encrypted before upload and decrypted after download.
All you need in a team collaboration tool dedicated to small efficient teams. Chat, notes, drive, online collaborative edition, calendars, news, spaces, notifications...
Very serious, free and open source !
FileRun is a full featured PHP web based file manager with a very easy to use user interface.
Linshare is an Open Source secure file sharing application intended to cover your business security and file transfer needs.
fruux is a free service that takes care of your contacts, calendars and more so you don't have to. Never manually copy contacts and calenders between your devices again!
Astian Cloud is a secure and private storage alternative where users can store their information, share files, edit files, video conferences and much more.
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FileCloud is also an on-premise solution like Nextcloud but gives more control over data and many more security features. FileCloud provides seamless collaboration, secure file exchange and better mobility compared to Nextcloud. Many features like full text search, federated search, antivirus/ransomware protection, powerful admin controls, a better user interface than Nextcloud and amazing customer support than Nextcloud, FileCloud is definitely the best alternative to Nextcloud.