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Murray Altheim has released Ceryle which
"is a free tool to help you get organized. If you use a lot of post it notes, are a writer, journalist, researcher, student, or anyone compiling a lot of information for a project, maybe just trying to organize your recipes, bookmarks, or your MP3 collection, Ceryle is designed to assist you in keeping track of things. Ceryle includes features to help you store, find and even visualize your information, using what is called a graph visualization."