Never used it, but read good things about FontExplorer X. Excerpt:
FontExplorer X Pro – Font management from the font experts
Optimized for professional use, the FontExplorer® X Pro solution
gives you the power you need to manage all your fonts.
Now you can more easily manage, activate and organize your existing font collection as well as find and experiment with new fonts. Whether you’ve got a hard drive full of typefaces or a few cherished families, FontExplorer X Pro handles your font library quickly, efficiently and reliably. And when you’re ready to add to your collection, you can view thousands of classic designs and the latest releases from independent foundries using the integrated store.
FontExplorer X Pro features an enhanced user interface with a configurable toolbar, activation control, comprehensive font information at your fingertips, customizable font previews, back-up functionality and access to FontExplorer X Server. Used together, FontExplorer X Pro and FontExplorer X Server are your complete solution for organizing, exploring and buying fonts and managing font licenses.