I have uploaded some tools I have to help in syllabification of texts in Latin and Spanish: http://marello.org/tools/syllabifier/.
It can also automatically prepare the text for Gabc use by putting in empty parentheses instead of syllable dividers.The Latin syllabification uses the rules from Collins' "A Primer on Ecclesiastical Latin" and Wheelock's Latin instruction. As others have noticed, sometimes syllabification will differ for music settings to help the singer in proper execution, so your mileage may vary.
The Spanish rules come from http://sramatic.tripod.com/silabas.html.
I just recoded it into Javascript from C# so it might be buggy...
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