Vocaroo is a great voice recording service which I often use with my students. They can use it to prepare for in-class presentations or send me their final spoken presentations from home. It can also contribute towards any speaking assessment grades which many schools often require term by term.
Students are set the task of sending their recordings via email, or if they aren’t too shy they can post it to the class wiki for other students to hear.
Here’s a video explaining how to use Vocaroo:
It is much easier to give back feedback on a short recording than trying to listen to one student in a class of 16! I set a time limit on the recordings to make sure that students don’t get carried away and send super long recordings! I generally don’t assess anything over this time limit.
It is ideal for exam preparation topics such as Cambridge First or IELTS Speaking Test part 2.