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Pars I: Porphyrii Isagoge et in Aristotelis Categorias commentarium. Pars II: Dexippi in Aristotelis Categorias commentarium. Pars III: Ammonius in Porphyrii Isagogen sive V voces [PDF ebook] 

Commentaries on Aristotle’s writings have been produced since the 2nd century AD.  This edition contains Greek commentaries on his work from the 3rd to the 8th centuries AD by, among others, Alexander of Aphrodiensias, Themistios, Joh. Philoponus, Simplicius in Greek.