Windows only: Nomad.NET is a powerful alternative file manager complete with breadcrumbs, thumbnails, integration with explorer plugins—and even support for multiple tabs.
Using Nomad.NET requires very little explanation—just download, extract, launch the executable, and start browsing through your file system. Where Nomad really shines is the level of customisation you can do—you can tweak almost any of the UI elements, create bookmarks to common folders, open multiple tabs, or even add in your own custom tools to the menu. Unlike some of the other alternative file managers, when you right-click on a file or folder you'll actually see the system context menu, complete with any extra menu items—like Dropbox, for instance.
Nomad.NET is a free download for Windows only. For more, check out our list of the five best alternative file managers.