MOA (Massive Online Analysis)
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.
MOA performs BIG DATA stream mining in real time, and large scale machine learning. MOA can be extended with new mining algorithms, and new stream generators or evaluation measures. The goal is to provide a benchmark suite for the stream mining community.
SAMOA (Yahoo Labs), a new framework for distributed stream mining, can be easily used with S4, Samza or Storm.
ADAMS, a novel, flexible workflow engine, is the perfect tool for maintaining MOA real-world, complex knowledge workflows.
The MEKA project provides an open source implementation of methods for multi-label classification and evaluation.