This is the case with Interchange Arcade, which I came across thanks to Leonardo Links.
Interchange is a four-level course published by Cambridge University Press which focuses on international communication and presents its content using real-world topics.
On the online Interchange site we can find lots of activities which are primarily devised for users of the method, but which can also be of interest for everybody, as they are self-contained. The types of activities include matching, fill in the blanks, multiple choice and crosswords, and a lot of them include audio files.
You can also download the audio files used in the books.
So why not explore this site? The menus are user-friendly and give a detailed description of what we can find in each of the books. Básico 1 students can start surfing the Introductory Book and Básico 2, Book 1. Move on from here to find more challenging material or material that suits your needs.
