There are a considerable number of Latin humanist manuscripts online at Cesena here. These include Augustine, Justinus, Pliny the Elder and Younger, Suetonius, and so on. The introduction is here. For some reason the catalogue entries are not with the images, not even which works begin on which folios. But the images are super!
Update: here I find a bunch of manuscripts at Lyons, including an 7-8th century ms. of Rufinus’ translation of Origen’s homilies on Genesis, Exodus and Leviticus; and a 5th century ms. of his Commentary on Romans.