LibriVox - free public domain audiobooks
Perfect Ear - A simple yet advanced application for improving your solfege skills.
Audible - Audible is the world’s largest provider of premium audiobooks and spoken word content.
EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
Islamic Audiobooks Central - Listen to audiobooks about religion, spirituality and philosophy from the Islamic perspective.
GitHub Audio - Tracks events across GitHub to generate calming work music