http://www.perseus.tufts.edu/hopper/collection?collection=Perseus:collection:Greco-Roman is a little chaotic, but don’t let that intimidate you! This website is a collection of myriad texts, ancient and modern alike.
https://www-loebclassics-com.oxy.idm.oclc.org/ is an excellent digital library, containing works by hundreds of authors in the original with side-by-side translations. Use your Oxy credentials to log in and access the collection.
https://www.youtube.com/watch?v=qI0mkt6Z3I0, a lengthy and lovely recitation of a part of Book 6 of Homer’s Iliad.
https://www.youtube.com/watch?v=4hOK7bU0S1Y is a good segment on Ancient Greek music, and a very useful piece of the puzzle.
for more on the double-reed pipe, or aulos.
https://www.youtube.com/watch?v=4UWBo0rsuHU for info on the other side of Ancient Greek music, the kithara (origin of our very own guitar).
https://www.youtube.com/watch?v=mQKRAJTgEuo Whatever you might think of him, here is Boris Johnson reciting the beginning of the Iliad like a professional:
https://rhapsodoi.org/index-of-ancient-greek-recitations/ Last, but not least, here is the website of the Society for the Oral Reading of Greek and Latin Literature, or SORGLL, with a heaping helping of recitations in Ancient Greek.
http://www.typegreek.com is a fantastic and useful website allowing you to type in Ancient Greek with ease! Refer to the Alphabet Key to figure out how to include breathing signs, accents, iota subscripts and more.
This one is just for fun: a side-by-side list comparing forms of Proto-Indo-European and its descendants, Sanskrit, Latin and Ancient Greek! https://allthingslinguistic.com/post/162178453172/latin-ancient-greek-and-sanskrit-triplets
Here is a collection of principle parts from Smyth’s Greek Grammar.