FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
Mockup Generator - Create attractive product screenshots with just a few clicks
BirdFont - Birdfont is a free font editor which lets you create vector graphics and export TTF, OTF, EOT and...
Previewed - Beautiful mockups & graphics for your next app