This directory contains programs that generate networks and graphs. Most are in the DIMACS format. For the others, format translators are or will soon be available. Generators suitable for multiple problems are in this directory---problem-specific generators appear in subdirectories. This Directory Contains: ac.c : Generates a fully dense acyclic network in .max format. A C version of waissi/ac.pas. Submitted by J. Setubal asnmin.a : Awk language converter from DIMACS assignment format to DIMACS min-cost flow format assign.c : Generates a random bipartite graph in .asn format. assign.old.c: Aan early version with fewer features. capt/ : A directory containing files for the CAPT network generator of Bland and Jensen. Networks are in .min format. ccd/ : A directory containing a shell script for generating all maxflow instances for the DIMACS Core Experiments. genrmf/ : A directory containing files for the RMFGEN network generator. Networks are in .max format. geomasn.a : Awk language converter from DIMACS .geom format to a bipartite network in .asn format. Read the file for more information. gridgen/ : Contains a c program for generating the grid-network of Lee and Orlin. grid-on-torus/ : A direcotry of files to generate capacitated transporation instances laid out on a grid-on-torus. Files are in .min format. gridgraph/ : A directory of files to generate min-cost problems on a grid. files are in .min format. maxmin.a : Awk language converter from DIMACS max-flow format to DIMACS min-cost flow format. mesh/ : Files for a generator of max-flow problems on a mesh. Instances are in .max format. netgen/ : A directory containing a well-known NETGEN program. Also contains a C-version which produces instances in DIMACS .min format. tr.c : Generates at transportation network. A C version of waissi/tr.pas. Contributed by J. Setubal. twocost.a : An awk langague program. Takes networks in .asn format: arc costs > 50 are converted to 10^8, and arc costs <=5 are converted to 10^2. waissi/ : A directory containing several generators for max-flow problems. Pascal and Turbo-Pascal versions available. washington/ : A directory containing code for several max-flow generators.