The best Cloud Storage alternative to FileZilla is Cyberduck, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to FileZilla and five of them are Cloud Storage Services so hopefully you can find a suitable replacement. Other interesting Cloud Storage Service alternatives to FileZilla are CarotDAV, AeroFTP, IQBox FTP and Nubbo.
A libre FTP, SFTP, WebDAV, S3, Backblaze B2, Azure & OpenStack Swift browser.
Great FTP Client software.
Cyberduck is a good FTP/SFTP client for macOS and Windows. It's been my go-to FTP software for years, and it has a much more modern and clean interface compared to FileZilla. The only drawback is that it's not available for Linux.
CarotDAV is a Simple WebDAV / FTP / SkyDrive / DropBox / GoogleDrive / Box / SugarSync client for Windows OS, available free of charge. It is also able to read GoogleDocs or IMAP.
A modern, open-source file manager and client for FTP, SFTP, WebDAV, and S3, featuring an AI assistant, cloud sync, and military-grade encryption.
IQBox lets you sync your files easily using any FTP site. It monitors your files in real-time. The interface is easy-to-use for beginners. It also can be used as a command-line tool.
Nubbo is a cloud storage manager that brings all your cloud providers together in one place.
Switzerland
Japan
Spain
EU
Free, open source and well designed!