Network data is sometimes freely available online.

Here are some examples.

## Real networks and data

- many sources in the KONECT site
- web map as a graph DOMES project (example of result)
- resources from INSNA: http://www.insna.org/software/data.html
- the numerous networks shared by Mark Newman http://www-personal.umich.edu/~mejn...
- datasets from the iCeNSA group (many resources related to A. Barabasi) :

http://www.nd.edu/~networks/resourc... - data shared by Jure Leskovec: large networks, internet datasets http://snap.stanford.edu/
- numerous links in the Roldan Pozo’s page : http://math.nist.gov/~RPozo/complex...
- pajek datasets http://vlado.fmf.uni-lj.si/pub/netw...
- p2p eDonkey data from Mathieu Latapy http://www-rp.lip6.fr/~latapy/tenweeks/
- many biological datasets here: http://cyvision.ifsc.usp.br/network...
- Barabasi-lab: http://www.barabasilab.com/rs-netdb.php
- links for social networks listed by the Institute for Quantitative Social Science (IQSS): http://dvn.iq.harvard.edu/dvn/
- the network of electricity distribution is shared in the ENTSO-E website: https://www.entsoe.eu/resources/gri...
- GEPHI dataset https://github.com/gephi/gephi/wiki...

## Artificial networks

Collection of artificial graphs (simple or classic ones): http://cs.anu.edu.au/~bdm/data/grap...

## Populations

* the populations from Network Dynamics and Simulation Science Laboratory (NDSSL) http://ndssl.vbi.vt.edu/opendata/in...

## Number of graphs

- various: http://mathworld.wolfram.com/Connec...
- Number of disconnected graphs with n nodes http://oeis.org/A000719
- Number of connected unlabelled graphs with n nodes ( 1, 1, 1, 2, 6, 21, 112, 853, 11117, 261080, 11716571, 1006700565, 164059830476, 50335907869219, 29003487462848061, 31397381142761241960, 63969560113225176176277, 245871831682084026519528568, 1787331725248899088890200576580, 24636021429399867655322650759681644,...) http://oeis.org/A001349 (see http://oeis.org/A001349/b001349.txt for data)
- Counts of graphs - detailed series for various densities http://keithbriggs.info/cgt.html

## Misc

Arvix papers about complex networks: http://xstructure.inr.ac.ru/x-bin/t...