Interesting sites

I have found a few interesting websites in regards to Spanish teaching.
These sites have, for the most part, exercises that help the students practice grammatical concepts. I like to give them to the students as a homework, so that they can come better prepare to class, and that they can reaffirm the concepts saw in class.
The first one is a site created by Barbara Kuczun Nelson. It has different exercises for basic to intermediate Spanish learners. It does have though important basic grammar structures, most of which are hard to learn and acquire, particularly to native English speaker. You can find the site by clicking here.
This site does not have much movement, but the exercises it already provides are of very good quality, and like I said, of important concepts. These concepts include "por o para", "ser y estar", conjugate verbs like "gustar", and when to use "el pretérito perfecto simple" and "el pretérito imperfecto".

Another site that I like a lot and often refer my students to is this one. It has very short videos of different Spanish native speakers performing a variety of tasks, which tasks are classified according to level of difficulty. I have found this site to be good for listening comprehension, as well as to give input to my students and help them with pronunciation. Students also learn about culture.

Last, but not least, I have also used this site; it is a great site from the University of Iowa. The site explains and gives examples on how to do pronunciation in Spanish. There are sounds that are particularly hard for me to explain how to do them in Spanish, and this website, along with a few slides that I have created, are useful to help students improve their Spanish pronunciation.