Open Access Grammars

Biblical Hebrew
http://individual.utoronto.ca/holmstedt/Textbook.html

NT Greek
http://www.utexas.edu/cola/centers/lrc/eieol/ntgol-0-X.html

Classical Greek
http://www.utexas.edu/cola/centers/lrc/eieol/grkol-0-X.html

Ancient Sanskrit
http://www.utexas.edu/cola/centers/lrc/eieol/vedol-0-X.html
  
Hittite
http://www.utexas.edu/cola/centers/lrc/eieol/hitol-0-X.html

Sumerian
http://home.comcast.net/~foxvog/Grammar.pdf

Old Persian
http://www.fas.harvard.edu/~iranian/OldPersian/index.html