The following files are covered by the license in DejaVu-LICENSE.txt:
  DejaVuSans.ttf
  DejaVuSansMono.ttf

The following files are covered by the license in FreeFont-LICENSE.txt:
  FreeMono.ttf
  FreeSansBold.ttf
  FreeSansOblique.ttf
  FreeSans.ttf
  FreeSerifBold.ttf
  FreeSerif.ttf

The following files are covered by the license in LibBiolinum-LICENSE.txt:
  LinBiolinum_Kah.ttf
  LinBiolinum_Rah.ttf
  LinBiolinum_RBah.ttf
  LinBiolinum_RIah.ttf

The following files are covered by the license in GUST-FONT-LICENSE.txt:
  texgyrepagella-regular.otf
  texgyrepagella-bold.otf

The texgyrepagella... fonts come from http://www.gust.org.pl/projects/e-foundry/tex-gyre/pagella