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.
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
TruFont - TruFont is a font-editing application written with Python3, ufoLib, defcon and PyQt5.