The Gentium Fonts tarball was obtained originally from:

      http://scripts.sil.org/cms/scripts/render_download.php?\
site_id=nrsi&format=file&media_id=Gentium_102_L_tar\
&filename=%2Fttf-sil-gentium_1.0.2.tar.gz

At the time, the associated home page was:

      http://scripts.sil.org/cms/scripts/page.php?\
site_id=nrsi&item_id=Gentium

Note: These URLs were valid in 2006, but may have broken since then.

The  Gentium Fonts are  licensed under the SIL Open Font License.  For
details, see "license.txt".

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From the home page:

Gentium is  a typeface family  designed  to enable  the diverse ethnic
groups around the world who use the Latin script to  produce readable,
high-quality publications.  It supports  a wide range  of  Latin-based
alphabets and includes glyphs that correspond to all  the Latin ranges
of Unicode.
            
The design is intended to be highly readable, reasonably compact,  and
visually attractive.  The additional  "extended" Latin letters are de-
signed to naturally harmonize with the traditional 26 ones. Diacritics
are  treated with careful thought and attention to their use.  Gentium
also supports both  ancient  and  modern Greek,  including a number of
alternate forms.  These fonts were originally the product of two years
of research and  study by the  designer at the  University of Reading,
England, as part of an MA program in Typeface Design.
                   
Gentium is  freely available and may be used by anyone at no cost.  It
is  now  released  under  the  SIL Open Font License,  a free and open
source license that permits modification and redistribution.  Our hope
is that it will stimulate  literature production and  elevate extended
Latin alphabets to  greater parity with the  basic Latin alphabet.  We
also  hope it will  encourage other type  designers to  appreciate and
support those fascinating and beautiful extra letters.