Tagit is a simple, effective way to tag and rate any file on your computer. You can also search for documents that are tagged. Ratings are 0 - 5 stars. Commonly used tags are displayed as buttons for easy access.
Tagit uses OpenMeta to store tags, which means that tags are stored in a robust, scalable, searchable system.
Fully compatible with OS X 10.9, uses Apples new tagging system