JGraphT

JGraphT is an exceptional Java graph library that caters to those in search of mathematical graph-theory objects as well as algorithms. With JGraphT, users can now explore a wide range of graph types such as directed and undirected graphs, graphs with weighted or unweighted edges, labeled or user-defined edges, and edge multiplicity options including simple graphs, multigraphs, and pseudographs.

Additionally, JGraphT offers unmodifiable graphs that permit modules to provide "read-only" access to internal graphs, listenable graphs which allow external listeners to keep track of modification events, subgraphs graphs that are auto-updating subgraph views on other graphs, and all compositions of the above-mentioned graphs.

This Graph Library is further developed and caters to a diverse range of needs as it allows users to create graphs based on URLs, XML documents, Strings, and even graphs of graphs. It is important to note that JGraphT is licensed and distributed under the terms of the GNU Library or Lesser General Public License (LGPL).

In conclusion, JGraphT provides users with remarkable functionalities, making it a must-have software tool for those in need of Java graph libraries.