FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Google Fonts - Making the web more beautiful, fast, and open through great typography
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
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.
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
FontJoy - Get smart font pairings in one click