networkr

https://github.com/ykpeng/networkr

Networkr is a Ruby gem inspired by the Python package NetworkX. It includes basic functionality for the creation, manipulation, and analysis of graphs. Graphs supported include undirected single-edge graphs (weighted or unweighted), directed single-edge graphs (weighted or unweighted), and undirected multi-edge graphs (weighted or unweighted). Algorithms available include Dijkstra's shortest paths, Karger's minimum cut, Kosaraju's strongly connected components, and Prim's minimum spanning tree.