This document discusses open source educational technologies for teaching and learning. It introduces key terms like open source tools and educational technologies. It explains that technologies can help expand learning beyond textbooks and engage students in different ways. Some potential benefits of technologies discussed include better simulations, virtual manipulatives, more efficient assessment, and interactive e-books. Several free web tools are also highlighted that can be used for teaching and learning across subjects, including Google Earth, ePals, ThinkFree Online Office, OpenOffice, and IBM's Many Eyes data visualization tool.