Windows/OS X/Linux/Android/iOS/Chrome/Firefox: Each platform has its own file manager, and they all come with a unique set of features. TagSpaces offers a single manager for everything, with a focus on tagging your files.
The app works differently to most file managers. For starters, you need to manually add sources, so it's probably not going to replace your usual system browser. You can add your own tags to your files and even sort your commonly used tags into categories.