The document discusses three free online tools - Google Docs, Pearltrees, and Scoop.it - that can be incorporated into Blackboard sites to support student interaction, knowledge building, collaboration, and creativity. Google Docs allows users to create, upload, share and access documents from anywhere. Pearltrees allows users to collect, organize, discover and share knowledge and information from the web. Scoop.it enables users to create online magazines containing images and links to websites. All three tools can be integrated into the classroom for activities like polls and surveys, presentations, knowledge maps, scavenger hunts, and curating media for projects.