TaggedFrog allows you to organize your files, documents and Web links. Just add objects to the library and tag them with any keywords. You can forget the file name or where the file is located. You can tag Web links, Microsoft Office documents, PDF documents, and images. In fact, you can tag any kind of file. Moreover, you can tag files directly from Windows File Explorer because the application is integrated with Explorer's context menu.
||.NET Framework 2.0 or newer (.NET Framework 3.5 SP1 recommended)