The idea behind BookMooch is pretty simple: get rid of a book you’re done with, and get a new one from someone else. The site is free to use and you can even trade with people in other countries. The site currently runs in seven languages: English, Dutch, Spanish, French, Italian, Portuguese, and Chinese.

Here’s how it works:

1. Type in books you want to give away.

2. Receive requests from others for your books.

3. Mail your books and receive points.

4. Ask for books from others with your points.

Join BookMooch here.