It’s a great idea to use free audiobooks in foreign languages to improve your level of comprehension as well as increase your vocabulary. Here are some sites to get you started:
Some of these sites also include the text and translation into English.
Free Peace Corps Language Learning Materials: Over 100 Languages Available
Free Children's Books Apps in Foreign Languages
Pronunciator: Free Vocabulary & Phrases in 60 Languages
Free Two Week French Course + Accommodation in Brussels, Belgium: Giveaway from Easy Languages
Free and/or Public Domain Materials for Listening to & Reading Languages Simultaneously
Improving Comprehension of Foreign Languages with TV Series, Movies and Subtitles