NexusFont - Choose and manage your fonts with Nexus Font.
Google Fonts - Making the web more beautiful, fast, and open through great typography
RightFont - The future of font manager software for Mac OS X
Typewolf - Typewolf helps designers choose the perfect font combination for their next design project—features web fonts in the wild, font recommendations and learning resources.
Font Manager - Simple font management for GTK+ desktop environments
Font Generator - Tons of font ideas in one click