Angel's Vox - Angel’s Vox is the first audio player on the market designed specially for audiobook enthusiasts.
Smart AudioBook Player - Smart AudioBook Player app comes up with features to help you in casting all your audiobooks to Chromecast enabled devices so you can enjoy them with your friends and family members.
BookDroid - BookDroid is an audio book listener for Android devices.
Voice - Convert texts to audio files easily... Write your text, click export.
Material Audiobook Player - Open Source Audiobook Player for Android
LibriVox - free public domain audiobooks