Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Smartmockups - Create stunning product mockups, easily and online.
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
Placeit - Generate realistic product shots in seconds
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.