Rapaio is an open-source statistical computing and data analysis library designed for Java, available on GitHub at https://github.com/padreati/rapaio. It offers a comprehensive range of tools for data manipulation, statistical analysis, visualization, and machine learning. The library is aimed at developers and data scientists who require a robust and flexible framework for conducting analytical tasks in Java. Rapaio's features include data frames, statistical tests, modeling techniques, and various plot types, all designed to facilitate in-depth data exploration and analysis.