9 audiobook apps to enjoy on your commute, hike or lunchtime walk

When you're a busy professional on the go, you likely want to have something to listen to on your commute. While music is great and a perfect way to relax, sometimes you want to get swept away in a novel or sharpen your skills with a business or self-help book.

Audiobooks can help you do that, and they've never been easier to access. Gone are the days of buying or renting CDs to get lost or scratched, and trying to remember where you last stopped. Smartphones bring a world of books to your fingertips.

There are many apps to choose from, so here are a few that might interest you.