The Gregorio Project – Typesetting of Gregorian texts
Caeciliae Gregorian Notation Font by Fr. Matthew Spencer, OSJ
Lilypond – for beautiful typesetting of modern music
Sacred Music Resources
Church Music Association of America (CMAA) – The CMAA offers lots of resources for the promotion of sacred Music in the Roman Catholic tradition. The website is full of online chant resources, pdfs of whole books of chant. It’s awesome! You can also buy books at CMAA Books.
Simple English Propers by Adam Bartlett- a great resource for parishes wanting to chant the propers for Mass. Though they are simple to sing, they are beautiful and add a dimension of dignity to the English liturgy.