NS-3
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The topology modules aim at reading a topology file generated by an automatic topology generator.
The process is divided in two steps:
Hence, model is focused on being able to read correctly the various topology formats.
Currently there are three models:
An helper ns3::TopologyReaderHelper is provided to assist on trivial tasks.
A good source for topology data is also Archipelago (http://www.caida.org/projects/ark/)
The current Archipelago Measurements, monthly updated, are stored here: http://data.caida.org/datasets/topology/ipv4.allpref24-aslinks/ (complete notation and triple data source, one for each working group)
A different and more compact notation that signs only the AS-relationships is here: http://www.caida.org/data/active/as-relationships/index.xml (a sort of more Orbis-like format)
The compact notation can be easily stripped down to a pure Orbis format, just removing the double relationships (the compact format use one-way links, while Orbis use two-way links) and pruning the 3rd parameter. Note that with the compact data Orbis can then be used create a rescaled version of the topology, thus being the most effective way (to my best knowledge) to make an internet-like topology.
Examples can be found in the directory src/topology-read/examples/