Showbie

 Showbie

https://app.showbie.com/ 
https://my.showbie.com/signin 

 Features:

• Assign: Distribute assignments, instructions and resources to your students in a few taps. All related materials are kept in a shared folder for that assignment
• Collect: As your students submit work, Showbie keeps everything organized in a single, convenient location.
• Review: Add annotations, voice notes and text notes directly onto your students’ work in Showbie.
• Students join your class using a class code. No need for an email address to create an account.  You just need a unique user name and password.
• Only 100 assignments allowed in the free version