Choral Public Domain Library http://www.cpdl.org/ from this site you can download many kind of sheet music, including those used in Christian Orthodox Churches.
Sheet Music Archive of Boris Tarakanov http://notes.tarakanov.net/ many scores are available on this site. used in different occassions. Special part of the site is russian church music (\"Руская духовная музыка\"), where you can download many scores.
Missionary of Ukranian Orthodox Church http://orth-mission.org.ua/not.htm here you may find many scores. Great number of them are traditional melodies from Kiev, Ukraine and Russia.
Seminar of Moscow for Singers http://www.seminaria.ru/ excellent site; many scores available for download, including complete peaces
Small Kliros http://vovsite.narod.ru/ interesting site with a lot of hymn melodies as harmonized russian chant
Nikola Resanovic - Serbian Chant http://www.nikolaresanovic.com/ excellent site, where you can find harmonized melodies of Orthodox Serbian chant, but with text in English
Eastern Church Music Resources http://ecmr.t5.fi/ finish site with many types of music intendent for orthodox Godservices, available in english, churchslavonic and finish languages.
Kerubin http://kerubin.org/ Orthodox music and sheet music, mostly of Russian composers
BIBLION - Christian Orthodox Multimedia Library http://biblion.realin.ru orthodox music, films, books etc.
Sacred academies and seminars
website of winter sacred academy, which takes place every winter in the monastery of St. Stevan in Lipovac near Aleksinac http://www.zimska-duhovnakademija.co.cc/ Winter sacred academy
