The document discusses several free web 2.0 presentation tools including SlideShare, Zoho Show, Thinkfree, and MixerCast. SlideShare allows users to import and share presentations but no online editing. Zoho Show and Thinkfree allow importing, editing, and sharing presentations online and support features like live webcasting. MixerCast focuses on blending various media types into shareable presentations rather than replicating PowerPoint. The document provides overviews and screenshots of the key features of each tool.