muCommander is a cross-platform file manager with a dual-pane interface.
With muCommander, you can easily copy, move, rename and batch rename email files and perform checksum calculations from a modern UI. It supports multiple tabs, universal bookmarks and includes a credential manager. You can also configure the keyboard shortcuts.
muCommander also gives you access to a virtual filesystem with support for local volumes, FTP, SFTP, SMB, NFS, HTTP, Amazon S3, Hadoop HDFS and Bonjour.
If you are looking for a new file manager that includes support for many filesystems/archives formats, bookmarks, credentials management, themes, etc., then muCommander may be the app you are looking for.