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	Combinatorics Software of the Algorithms Project - http://algo.inria.fr/libraries/software.html Combinatorial analysis, discrete mathematics and computer algebra are the main interests of the Algorithms Projects. The packages let you define combinatorial structures; manipulate the associated generating functions, functional equations or recurrences; study their asymptotic behaviour.
	http://cs.anu.edu.au/~bdm/nauty/ - http://cs.anu.edu.au/~bdm/nauty/ A program for computing automorphism groups of graphs and digraphs. It can also produce a canonical labelling.
	NetworkX - http://networkx.lanl.gov/ NetworkX (NX) is a Python package for the creation, manipulation, and study of the structure, dynamics, and functions of complex networks.
	The LEDA Library - http://www.mpi-sb.mpg.de/LEDA/leda.html LEDA is a library of the data types and algorithms of combinatorial computing.
	SF, Posets and Coxeter/Weyl - http://www.math.lsa.umich.edu/~jrs/maple.html John Stembridge's Maple packages for symmetric functions, posets, root systems, and finite Coxeter groups.

	plantri and fullgen - http://cs.anu.edu.au/people/bdm/plantri/ Programs for generation of certain types of planar graph, generated in such a way that exactly one member of each isomorphism class is output without the need for storing them.
	Information System on Graph Class Inclusions - http://wwwteo.informatik.uni-rostock.de/isgci/ A java applet for researching what is known about particular graph classes.
	LINK: A Software System for Discrete Mathematics - http://dimacs.rutgers.edu/~berryj/LINK.html A general-purpose, extendible computing environment in which discrete mathematical objects representing real world problems can be easily manipulated and visualized.
	http://phalanstere.univ-mlv.fr/~ace/ACE/3.0/ACE.html - http://phalanstere.univ-mlv.fr/~ace/ACE/3.0/ACE.html An Algebraic Combinatorics Environment for MAPLE providing functions to work with classical structures in algebraic combinatorics. Free download.
	Free Software in Graph Theory - http://www.geocities.com/pechv_ru/ Free Software for Win 9X,NT on Graph Theory by Vitali Petchenkine. Procedures: Metrics of the graph; Paths and cycles; Colorations; Automorphism group; Minimal spanning tree; Shortest paths; Max. Capacity path; K Shortest paths; Salesman problem; Maximal flow; Critical path; Reports for Graphs; Print.

	http://www.maths.qmul.ac.uk/~leonard/grape/ - http://www.maths.qmul.ac.uk/~leonard/grape/ A GAP package for computing with graphs; primarily designed for the efficient construction and analysis of graphs related to groups, combinatorial designs and finite geometries.
	METIS: Family of Multilevel Partitioning Algorithms - http://www-users.cs.umn.edu/~karypis/metis/ Graph, mesh, and hypergraph partitioning software.
	http://jgrapht.sourceforge.net - http://jgrapht.sourceforge.net Free Java class library that provides mathematical graph-theory objects and algorithms.
	Algorithms and Software for Partitioning Meshes - http://www.cs.sandia.gov/CRF/chac.html Using combinatorics to solve structured linear systems of equations.
	Graph Partitioners - http://www.cs.cmu.edu/~scandal/alg/separator.html Three algorithms written in NESL for finding separators of graphs, in order to compare the quality of the cuts.

	Graph Magics - http://www.graph-magics.com A tool for graph theory, having a generator and offering various algorithms: shortest paths, network flows, maximal clique, optimal coloring etc.
	GOBLIN Graph Library - http://www.math.uni-augsburg.de/opt/goblin.html C++ library of graph optimization algorithms with a GUI for editing, running and tracing the algorithms.
	GraphThing - http://graph.seul.org/ Tool for investigating Graph Theory, with a GTK interface. Free under GPL. Unix, source code in C++.
	Gato: The Graph Animation Toolbox - http://www.zpr.uni-koeln.de/~gato Software for visualizing graph algorithms. Free under GPL. Unix, Linux, MacOs ad Windows versions.
	graph-utils - http://graph-utils.sourceforge.net A set of small utilities realizing theoretical graph algorithms (including tree algorithms). The utilities work with simple text input/output formats.

	Graph Coloring By DSATUR - http://prolland.free.fr/works/research/dsatphp/dsat.html By using the DSATUR algorithm, this php/form colors any graph in the Dimacs format.
	SCL - Star Complement Library - http://www.math.rs/~zstanic/scl.htm A program for computing the maximal graphs using the star complement technique including programs for computing the maximal cliques and the isomorphism classes of graphs.

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