This document discusses various free web applications that can be used to increase student and parent engagement, including wikis, blogs, file sharing tools, and presentation tools. It provides examples of wikis like Wikispaces that allow collaborative writing, blogs for communicating with students and parents, and file sharing tools like Drop.io for sharing assignments and notes online. These applications improve communication, are accessible anytime from any device, and make the operating system irrelevant for collaboration and file sharing.