XYplorer is described as 'File manager for Windows. It features tabbed browsing, a powerful file search, a versatile preview, a highly customizable interface, optional dual pane, scripting engine, and a large array of unique ways to efficiently automate frequently recurring tasks' and is a very popular File Manager in the file management category. There are more than 50 alternatives to XYplorer for a variety of platforms, including Windows, Mac, Linux, BSD and PortableApps.com apps. The best XYplorer alternative is Double Commander, which is both free and Open Source. Other great apps like XYplorer are Total Commander, Files, Spacedrive and Dolphin File Manager.
Tree on the left, tabs and panes (horizontal & vertical), optical filters - it's great.