http://www.teachthought.com/technology/10-tips-for-using-voicethread-for-learning/

VoiceThread is an online application that allows individuals to communicate with each other through the use of text, video, and audio.

Students can create, comment, and share their creations with the option of using a variety of privacy settings. The age requirement for this application is 13. However, if under the age of 13 a teacher or parent could sign the student up.

This tool can remove certain barriers of different learners by being free, accessible, and has the beneficial aspect of being an online environment. Some students may enjoy learning and sharing through text/creating videos. This type of visual learning also allows students from not being intimidated from the idea of presenting in the classroom. Students may become more comfortable with the material they are learning by displaying their knowledge in a different way. 

https://voicethread.com/