Another great site for the classroom is Internet 4 the Classroom. The website has resources for grades K-12. The site has lesson plans, interactive websites, test prep, daily dose of internet, and teaching training. The site is free and lists on free websites (which is what we love). The resources are organized by grade, subject, and skill and is very easy to navigate.
The site also has a great free summer program. Students that have access to the internet can login to the site and practice skills over the summer. The information is the sent to their mentor (the teacher) to keep track of and to use to prepare for the next school year. I hope you enjoy!