Orange is a free, open source data visualization and analysis tool. It allows users to conduct data mining either through its visual programming language, or via Python scripts, and includes components for machine learning. Orange includes both add-ons for biometrics and text mining, and data analytic features.

Pajek is a free tool for large network analysis and visualization in continuous development since 1996. It can handle large datasets from diverse sources, such as collaboration networks, citiation networks, data mining, and Internet-derived networks. Pajek is only available for Windows, and was implemented in Delphi (Pascal).