Pajek.net files from Roget's Thesaurus. Tag Clouds Two Point Oh? [flickr-photo:id=15085782,size=m] Tag clouds bore me. They’re a relatively effective way of indicating quickly what topics are popular but that’s it. From del.icio.us’ cloud I can see that the site is for nerds – web nerds specifically. Flickr’s tag cloud tells me that people tag events and place names but that’s about it. My personal tag clouds on these sites tell me even less. Pygraphviz - NetworkX trac - Trac. GUESS: The Graph Exploration System. Tulip Software home page. Orange. Gephi, an open source graph visualization and manipulation software.