Audible - Audible is the world’s largest provider of premium audiobooks and spoken word content.
Intercom for startups - Eligible startups get advanced Intercom features and Early Stage Academy at a 95% discount.The plan comes with 10 seats and 2,000 people reached.
LibriVox - free public domain audiobooks
Intercom on Starting Up - A book about growing a startup
LearnOutLoud.com - LearnOutLoud.com is the web's largest resource for audio & video learning.
The Creative Marketer - Techniques & tools for copywriters, marketers, and creatives