Bitmap font importer is just perfect Unity asset plugin to import any custom bitmap font to your project.
It easy imports any bitmap font generated by third party tools like:littera, bmGlyph, Glyph Designer 2 or ShoeBox
Thiks @Xylph, this origin code form here
Feature list:
* Auto Import bitmap fonts
* Support XML and Plain text format of .fnt
* Reimport exists bitmap font
* Open source code
* Tested with Unity 5.x
* No runtime resources required
* No scripting required