FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
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Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
TruFont - TruFont is a font-editing application written with Python3, ufoLib, defcon and PyQt5.
Framer - 🔥 Design real websites right on the canvas.
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.