What it is:
FontForge (formerly known as PfaEdit) is a typeface (font) editor
program developed by George Williams. Fontforge is free software and
is distributed under the BSD license. FontForge is available for
several operating systems and is localized in several languages.
Fontforge supports several font formats, such as TrueType, PostScript,
OpenType, CID-keyed, multi-master, CFF, SVG, BDF, Datafork TrueType,
etc., and can convert fonts from one format to another.
To know more about:
sudo apt-get install fontforge