OpenJGraph is a Java library to create and manipulate graphs. Its features include directed, undirected, directed-acylic, and weighted graphs, and simple graph algorithms such as graph traversal, minimum spanning tree, and shortest path spanning trees for weighted graphs. The library also has some support for graph drawing, including straight line and orthogonal graph drawing, and for user interaction such as creating and removing a vertex, creating and removing an edge, dragging a vertex, and changing some of the vertex and edge properties.
