RightFont - The future of font manager software for Mac OS X
Font Viewer - Font Viewer is an application which does exactly that - it views fonts!
FontFont - World’s largest library of original contemporary typefaces.
NexusFont - Choose and manage your fonts with Nexus Font.
WordMark.it - If you are a font lover, here is the best platform for you named as Wordmark.
Font Manager - Simple font management for GTK+ desktop environments