Like Coursera, many of edX’s courses were developed by accredited universities, and you can obtain certificates of completion at the end of your studies. Unlike Coursera, edX’s courses are all free to audit, non-profit, and open-source. It was originally founded by Harvard and MIT, and since then has been joined by universities around the globe.
The Spanish and Italian courses in particular have many activities to reinforce your learning, including writing, reading, speaking, and listening activities. The Chinese course is less comprehensive, but could still teach you the basics if you don’t mind watching lots of videos — although, the Peking University courses on Coursera may be a better option. The Steps in Japanese series also includes lots of videos, but these videos are interactive and quiz you on the material.
Overall, Coursera seems to have a better platform than edX, and their courses may be more intuitive to navigate. However, that shouldn’t stop you from trying out what edX has to offer, especially considering that you can get most of it for free. After you have learned the basics, you can enrich your knowledge through Open Learn’s free language courses.