NexusFont - Choose and manage your fonts with Nexus Font.
Font Manager - Simple font management for GTK+ desktop environments
What Font Is - Find any font from any image (commercial or free)
Fonts Ninja - Try fonts discovered on websites in any design software
Font Finder - FontFinder is created for designers, developers and typographers.
FontScanner - FontScanner is an application that helps you to find any font name, type, size, color, and family.