Prototypo - Streamlining font creation with open source typeface editor
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
BitFontMaker2™ - Fast and easy Online Bitmap font Editor.
BirdFont - Birdfont is a free font editor which lets you create vector graphics and export TTF, OTF, EOT and...
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
FontLab VI - font creation and editing, including variable fonts and color fonts