WEKA (Waikato Environment for Knowledge Analysis) is an open source machine learning software in JAVA. It contains tools for data preparation, classification, regression, clustering, association rules mining, and visualization.

It has been downloaded more than 10,542,000 times.

It is the most popular open source software for Machine Learning in Java.

It is the most popular tool to learn Machine Learning, thanks to the best-selling book “Data Mining” and MOOC courses.

It has been cited in more than 18,000 research and applied data science publications.

It is one of the oldest available machine learning systems available, having started development in 1993, and it is still very active in the machine learning / data mining / AI space.