The library "libotf" provides the following facilites.

    o Read Open Type Layout Tables from OTF file.  Currently these
      tables are supported; head, name, cmap, GDEF, GSUB, and GPOS.

    o Convert a Unicode character sequence to a glyph code sequence by
      using the above tables.

The combination of libotf and the FreeType library (Ver.2) realizes
CTL (complex text layout) by OpenType fonts.

Homepage:
https://savannah.nongnu.org/projects/m17n
