Design or simulate networks to perform their analysis. Visualize networks containing a huge number of vertices. Work with partitions, vectors, permutations, clusters and the hierarchy, record macros, and perform multiple operations on the displayed data.
Downloading Pajek 5.19 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The program is categorized as Internet & Network Tools. We recommend checking the downloaded files with any free antivirus. The actual developer of the free program is University of Ljubljana. The most popular versions among the program users are 5.1, 5.0 and 3.1. The program's installer file is generally known as Pajek.exe.
From the developer:
Pajek, PajekXXL and Pajek3XL are program packages for analysis and visualization of very large networks (networks containing up to ten billions of vertices, there is no limit - except the memory size - on the number of lines). Pajek has been available since 1996. The program, documentation and supporting material can be downloaded and used for free for noncommercial use from its web page: http://mrvar.fdv.uni-lj.
You may want to check out more software, such as Gephi, which might be similar to Pajek.