LibriVox - free public domain audiobooks
ReadEra - Read book files in EPUB, PDF, DOC, DOCX, RTF, TXT, DJVU, FB2, MOBI and CHM formats.
Audible - Audible is the world’s largest provider of premium audiobooks and spoken word content.
FullReader - FullReader app allows users to create a library of digital books, magazines, comics, and many other eBooks to play the translation of the desired book without much of a stretch.
Hoopla Digital - Audio books, movies, music, and ETC. Very similar to libby.
Voice Book Reader - Allows you to read aloud books PDF, EPUB, and text files. Free online book reader.