OpenPajek is a network analysis software that aims to be an open source replacement to proprietary software such as Pajek or UCINET. Its core is igraph, a robust and efficient C library for analyzing networks
It can be used to help understand how micro behavior of the individual nodes yields to important changes in the global structure of the network.

Network Generation
1. Erdos_Renyi: Generates a graph based on the Erdos-Renyi model. Parameters: n - the number of vertices. p - the probability of edges. If given, m must be missing.
2. Lattice: Generates a regular lattice. Parameters: dim - list with the dimensions of the lattice
3. Barabasi: Generates a graph based on the Barabasi-Albert model. Parameters: n - the number of vertices m - number of outgoing edges generated for each vertex
4. Watts: Generates a regular lattice of dimension 1 (ring) where each vertex is connected to its 4 nearest neighbors. Generates a high clustering coefficient. Parameters: n - the number of vertices

Simulation
All simulation processes behave similarly. A random link is removed and a new one is created following a specific strategy.

Layouts
A layout is an algorithm that locates the nodes of a network on a two dimensional space.

Plots
There are three plots shown in the main window.

The license of this software is Free, you can free download and free use this network utility software.