Latex is a typesetting system that is widely used in documents with a lot of mathematical and technical content, but it is equally suited to the humanities. Here are a few packages relevant to fine typesetting of humanistic texts.
ellipsis.sty
ellipsis.sty is a package that corrects the spacing around ellipses in LaTeX.
Polytonic Greek
Before Unicode, it used to be that the best solution for polytonic Greek with TeX was to use Pierre MacKay's Ibycus font. To that end, I wrote some LaTeX support for it. But nowadays you should use Jonathan Kew's XeTeX for Unicode-based TeX, along with an OpenType font, such as one the excellent free fonts from the Greek Font Society or one of Adobe's commercial offerings.
I have written a script called elhyph-utf8 that takes the hyphenation patterns from the elhyphen package by Dimitrios Filippou and modifies them to work with XeTeX. There are similar offerings available on CTAN.