Either for Social Networks Analysis, for Multi-agent simulation or Text mining, networks are everywhere and everyone seems to be producing their own library. Here’s a quick collection of some popular libraries that integrate well with Python (among other things).

NetworkX (1.4) – http://networkx.lanl.gov/ Python Full python and slow for large number of nodes.

igraph (0.5.4) – http://igraph.sourceforge.net/index.html python extension module, R package, Ruby gem or as C library Finding it very useful to use with R <- integrates perfectly with other thing I do in R.

boost – http://www.boost.org/ C++