FontForge

FontForge is a FOSS font editor which supports many common font formats. Developed primarily by George Williams until 2012, FontForge is free software and is distributed under a mix of the GNU General Public License Version 3 and the 3-clause BSD license. It is available for operating systems including Linux, Windows, and macOS, and is localized into 12 languages.^{[which?][citation needed]}

To facilitate automated format conversion and other repetitive tasks, FontForge implements two scripting languages: its own language and Python. FontForge can run scripts from its GUI, from the command line, and also offers its features as a Python module, so it can be integrated into any Python program.

FontForge supports Adobe's OpenType feature file specification (with its own extensions to the syntax). It also supports the unofficial Microsoft mathematical typesetting extensions (MATH table) introduced for Cambria Math and supported by Office 2007, XeTeX and LuaTeX. At least one free OpenType mathematical font has been developed in FontForge.

FontForge uses FreeType for rendering fonts on screen. Since the November 15, 2008 release, FontForge uses libcairo and libpango software libraries for graphics and text rendering, providing anti-aliased graphics and complex text layout support.

FontForge can use Potrace or AutoTrace to auto trace bitmap images and import them into a font.

Parts of FontForge's code are used by the LuaTeX typesetting engine for reading and parsing OpenType fonts.

The FontForge source code includes a number of utility programs, including 'showttf', which shows the contents of binary font files, and a WOFF converter and deconverter.

FontForge supports a wide variety of font formats. Its native Spline Font Database format (.sfd file name extension) is text-based and facilitates collaboration between designers, as difference files can be easily created. FontForge also supports the interoperable UFO source format, which is based on XML.