FreeCommander is the most important competitor and alternative for Total Commander. This tool is a manager of your files that will increase productivity and will make daily tasks easier.
FreeCommander have 2 panels to view simultaneously different location where you have files and you want to move, rename, delete etc. It supports drag and drop to move files easily, can compare and synchronize folders, view and sort files based on different criteria such as file date or other attributes.
Interface is available in many languages, can check MD5 checksums, works with archives and supports plugins.