file manager
SE-Explorer - File Explorer Replacement
SE-Explorer is an awesome Free Portable File Manager and Explorer for Windows (Windows File Explorer Replacement). SE-Explorer features a tabbed interface with dual pane browsing, a file search option, a file size scanner to help locate the largest files, resource (hex) view for exe files and icons, syntax highlighted text viewer, built in web browser and much more.
UltraExplorer - Portable File Navigation Tool
UltraExplorer was designed to be the ultimate file manager and can be used to replace Windows Explorer. It sports many additional features such as a customizable user interface, favorites window, filter window, history window and even comes with the option to run the command line window from the current directory.