A free open-source pathway analysis and drawing software. PathVisio allows you to draw, edit and analyse biological pathways. You can visualize your own experimental data on the pathways and find relevant pathways that are over-represented in your data set. PathVisio provides a basic set of features for pathway drawing, analysis and visualization. Additional features are available as plugins. Plugins are available for pathway building, pathway analysis, import/export functionality, data visualization or data integration. Plugins may be developed by anyone by using the PathVisio Plugin API.