Circos is designed for visualizing genomic data such as alignments, conservation, and generalized 2D data, such as line, scatter, heatmap and histogram plots. Circos is very flexible — you can use it to visualize any kind of data, not just genomics. Circos has been used to visualize customer flow in the auto industry, volume of courier shipments, database schemas, and presidential debates.
The creation of Circos was motivated by a need to visualize intra- and inter-chromosomal relationships within one or more genomes, or between any two or more sets of objects with a corresponding distance scale. Circos is similar to chromowheel and, to a lesser extent, genopix.
Found Here: http://mkweb.bcgsc.ca/circos/?