Weebly is a simple, free Web design and hosting system that takes nearly all the pain out of creating a site. You use drag and drop features to create the pages. As a teacher you can set up a class of 40 students, setting the user names and passwords of the students one by one, or by uploading a text file of students names, etc. The program lets you print out all passwords and as the teacher you can lock up the web sites so no one can see the student sites unless they have a password that you set up. This is for the security and safety of the students.
Another excellent feature of this tool is their blog area, which you can use for critical thinking activities and also for peer assessment as there is a comment section for his area.