ClassClimate that lets your students record and share with your how they feel in your classroom. My one criticism of the service was that it required students to have email addresses. ClassClimate responded to me on Monday with an update that they have removed the requirement for students to have email addresses.
ClassClimate now lets your students record how they feel by just going to a unique URL assigned to your teacher account. This new option is called "Speed Read." Just share your unique URL and then your students can take enter their feelings without any registration necessary.