What is Font Book?
Font Book is the standard font manager that comes with Mac OS.
The program enables users to: Preview and install font files, avoiding multiple instances of the same font. Review installed fonts using various sample texts and sizes. Group fonts into collections, which can then be used in all Cocoa programs. Activate/deactivate individual fonts or collections. Check the data integrity of font files. Export font collections for use on another computer
Font Book Screenshots
Font Book information