What Are Your Favo(u)rite Free ESL Apps?

Hi all!

I want to start a new thread about the latest free mobile phone applications that people are using. The technologies have really advanced.

Someone on this forum recommended eJOY and Listenexpress, which I downloaded. There is even a Karaoke sing-a-long app! I can say they are all excellent; however, they are not specifically designed for academic exam practice.

I didn't like Cambridge Write and Improve. :/

Today, I found this free Android IELTS preparation app:

https://play.google.com/store/apps/details?id=com.aamrspaceapps.ieltspreparation

Has anyone tried it?

Does anyone have any other free apps to recommend?

Thanks in advance for any suggestions!