Some websites that might be of interest to students:
http://www.middleschool.net/resources-middleschool-students.htm
http://www.sldirectory.com/studf/cool.html
http://www.connectionsacademy.com/blog/posts/2012-12-21/The-Best-Educational-Websites-and-Online-Learning-Games-for-K-8-Students.aspx
http://www.idigitaltimes.com/30-awesome-interactive-websites-elementary-middle-school-classrooms-common-core-338198