ListenWise is an online database of fascinating various topical articles by NPR. It's an online tool, which can be used hand in hand with Google Classroom. Each article has questions students can answer and the lessons are aligned with the Listening Common Core Standards.
As an English teacher, I use a variety of videos to help my students understand different concepts. The Khan Academy Grammar playlist includes about 100 videos, which cover multiple topics.
The Calm App is a wonderful socio-emotional resource for teachers and students alike. The Calm App allows you to listen to various sounds to help you calm your mind and emotions. This can be used in class to help students with their socio-emotional needs and guide them in self-regulation.