Windows: A single file, like a template, can be part of numerous projects or apply to multiple clients. Free file management add-on Tabbles creates drag-and-drop organisers that tag your files, instead of copying them, for quick access.
Tabbles, available as an installation or a portable app, acts as its own kind of Explorer window, providing icon-adorned "Tabbles" for dragging files onto and pulling them from. Doing so doesn't make a new copy or move the file or folder; it simply assigns that file to the project, assignment or however you think to organise your stuff.
When you access files inside their "Tabbles", you'll see the other categories they're tagged into and get quick access to its actual file location too. Check out the video up top for a demonstration of how Tabbles fits into a typical workflow.
Tabbles is a free download for Windows systems only.