Data for testing graph algorithms I am looking for a source of huge data sets to test some graph algorithm implemention. Please also provide some information about the type/distribution (e.g. directed/undirected, simple/not simple, weighted/unweighted) of the graphs in the source if they are known.
Check the following links for graph instances


DIMACS Graphs: Benchmark Instances and Best Upper Bounds
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Graph Coloring Instances



CLIQUE Benchmark Instances