IGen is a network topology generator. Unlike GT-ITM and BRITE, IGen does not rely on probabilistic methods to generate network topologies. Since real networks are the outcome of a careful network design, IGen implements various network design heuristics such as MENTOR, MENTour, Delaunay triangulation and Two Trees for the purpose of building network topologies.

A recent fork of this code is available at http://genc.tato.al/2017/10/17/igen-topology-generator-revived/