Google Fonts - Making the web more beautiful, fast, and open through great typography
MacType - MacType render windows font smoothly and much more convenient to read.
FontJoy - Get smart font pairings in one click
ClearType Tuner PowerToy - Windows XP and Vista users can use the online ClearType Tuner, or the ClearType PowerToy to...
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.
fontconfig - Fontconfig is a library for configuring and customizing font access. Fontconfig can: