There are over 200 Loebs that are in the public domain--many of them Koine. A complete listing, with links can be found here:
[Go there for live links and for available volumes]
Loebolus is based on Edwin Donnelly's "Downloebables" , aiming to make
all the public domain Loebs more easily downloadable by re-hosting the
PDF's directly, without the need to enter CAPTCHA's.
You can also download a .zip containing all 245 PDF's (3.2GB). Or view
the code used for generating this site on GitHub.
(HT: Jack Sasson)