With the proliferation of services to store files online (e.g. Dropbox, Google Drive, OneDrive, etc.) has come a proliferation of client software for interacting with those services. Cyberduck is a file manager that supports the most popular file storage services. It also supports common protocols like FTP, SFTP, and WebDAV. In addition, Cyberduck can make use of an external editor to provide editing of remote files (e.g., to edit a static website). Users of Amazon's Simple Storage Service (S3) will find integrated support for the extended features of S3 like file versioning, bucket lifecycles, access control lists, and multi-part uploads. Cyberduck's integrated support for Cryptomator encryption can encrypt files before uploading them to cloud storage for additional security. Users of multiple services may appreciate Cyberduck's bookmarking feature. Cyberduck is available for macOS and Windows.