Freading offers a selection of eBooks available at all times: no holds, no waiting. Free account signup required. The Freading App is available for Android and iOS devices. PC/Mac computers will need to download Adobe Digital Editions.
Libby by OverDrive offers a wide variety of downloadable and streaming media such as eBooks, audiobooks, magazines, tutorials, etc. Available through the Libby app or website and Overdrive website.
OverDrive offers both ebooks and downloadable audiobooks compatible with many different devices.