igraph is a C library for creating, manipulating and analysing graphs. It is intended to be as powerful (i.e. fast) as possible to enable working with large graphs.
See https://igraph.org for installation instructions and documentation.
igraph can also be used from:
- R — https://github.com/igraph/rigraph
- Python — https://github.com/igraph/python-igraph
- Mathematica — https://github.com/szhorvat/IGraphM