Gentium is a typeface family designed to enable the diverse ethnic groups around the world who use the Latin, Cyrillic and Greek scripts to produce readable, high-quality publications. It supports a wide range of Latin- and Cyrillic-based alphabets.
The design is intended to be highly readable, reasonably compact, and visually attractive. The additional ‘extended’ Latin letters are designed to naturally harmonize with the traditional 26 ones. Diacritics are treated with careful thought and attention to their use. Gentium also supports both polytonic and monotonic Greek. Gentium Plus now includes more extended Latin glyphs (Unicode 5.1), archaic Greek symbols, and full extended Cyrillic script support.
The Gentium and Gentium Plus font families currently include only regular and italic faces, but Gentium Basic and Gentium Book Basic give a preview of what a whole range of new weights will eventually look like. The 'Basic' fonts only support a limited Latin character set (no Greek or Cyrillic). Gentium Book is a companion family to Gentium that is altogether slightly heavier, and better suited for some publishing needs. It supports only the Basic character set at present, but will eventually match the full Gentium character set. More info and download link here