Fony

Fony is a bitmap font editor that you can use to create and edit Windows fonts of various file types.

You can edit the fonts pixel by pixel using three tools: pencil, line, and fill. You can also change the width of the selected character and its location on the plane.

Fony is compatible with various font formats, including: Windows bitmap fonts (FON and FNT), TrueType vector fonts, Amiga and BDF bitmap fonts, and so on.

However, the TrueType format is the only one that doesn't appear when saving changes made to a font.