Tag visualizer and search utility
OSX Mavericks brought tags to the main stream. Ammonite provides an easy to use interface to find tagged files quickly. It also works with OpenMeta tags and databases of DEVONtechnologies' excellent product DEVONthink Pro.
Ammonite visualizes the tags used in a database or on your filesystem. Tags applied to many documents will appear larger then tags applied to a few documents. This helps you to drill down on the information you are looking for. Quick Look works like in Finder: Select a document and hit the space bar for instant previews.
Ammonite is easy to use: Left-click on a tag in the cloud to find documents having this tag applied. Right-click to exclude documents with this tag from the result. Combine as many tags in your search as you need. The result is updated immediately.