Font Manager - Simple font management for GTK+ desktop environments
Gnome Font Viewer - A font viewer utility for GNOME
NexusFont - Choose and manage your fonts with Nexus Font.
Font Finder - FontFinder is created for designers, developers and typographers.
Maintype - MainType is a professional font manager that allows you to view, manage, install and print your...
RightFont - The future of font manager software for Mac OS X