FontForge

FontForge is a font editor for outline and bitmap fonts that lets you create, edit, or convert, a range of fonts, including PostScript, TrueType, OpenType, cid-keyed, multi-master, cff, SVG and BitMap (bdf, FON, NFNT) fonts.

FontForge is free Open Source Software written to run on various computer operating systems. You can use FontForge Graphically or as a command-line tool.

Learning to use FontForge is easy, and there are various tutorials available beginning with the basics up to more advanced features such as making and using scripts.