FontForge allows editing of outline and bitmap fonts. With it, you can
create new fonts or modify old ones. It also converts font formats and
can convert among PostScript (ASCII & binary Type 1, some Type 3s, and
some Type 0s), TrueType, OpenType (Type2), and CID-keyed fonts.

The XKBC engine for IBus platform.
It provides keyboard layout emulation input method.