The document introduces various visual and clustering search engines that can be used as tools for concept generation, mind mapping, outlining and more. It provides an overview of why these types of search engines are useful, including for term and concept discovery, tracking concepts graphically over time, and creating visual representations of concepts for presentations. The document then lists and provides brief descriptions and examples of selected visual and clustering search engines and tools, such as IncyWincy, Clusty, Don Busca, Exalead, Gigabalt, Grokker, and TouchGraph. It concludes by suggesting some potential applications of these tools, such as for concept clarification, overcoming writer's block, and assignments to compare or evaluate