MOA (Massive Online Analysis)
https://moa.cms.waikato.ac.nz/

MOA is the most popular open source framework for data stream mining, with a very active growing community (blog). It includes a collection of machine learning algorithms (classification, regression, clustering, outlier detection, concept drift detection and recommender systems) and tools for evaluation. Related to the WEKA project, MOA is also written in Java, while scaling to more demanding problems. This will be added to Data Mining Resources Subject Tracer™. This will be added to Artificial Intelligence Resources Subject Tracer™.