Your spell-checker may tell you that collaborize is a no-no, but when it's used in conjunction with classroom, it's a very big YES!
Collaborize Classroom is a feature-rich collaborative platform that can be used for class discussions, polls, quizzes and so much more. Teachers can create and customize a site that can then be accessed by a unique URL and password. Students can then easily create individual accounts, even without an email address, and be able to participate in online discussions, polls, projects or tests. Teachers can post topics chosen from the Topic Library provided by the site, or of their own design. Pictures, videos, and even documents can be attached to each topic for immediate reference. Your teacher dashboard allows you to easily manage students, groups, topics and a plethora of reports.
Collaborize Classroom is easy to set up and easy to use. There are plenty of free resources to help you get started, as well as topics and suggestions for keeping your students actively engaged. This site is one that can be useful for any grade-level or subject area, and all of this versatility is absolutely FREE!