This document introduces several free web 2.0 tools that can be used in K-12 classrooms, including video tools (Powtoon, Animoto), presentation tools (Prezi), image editing tools (Big Huge Labs), and QR code generators. It provides examples of how each tool can be used educationally, such as having students create video presentations, timelines, posters, or QR code scavenger hunts. The document also notes some limitations and challenges to using these free tools, such as limited features in free versions or the need for adequate technology access.