oracle/tribuo
Oracle Labs' Java machine learning library providing classification, regression, clustering, anomaly detection, and multi-label classification.

Tribuo is a comprehensive Java machine learning library that provides implementations of popular ML algorithms along with unified wrappers for external libraries. It handles the full ML workflow including data loading, featurization, transformation, and evaluation. Models can be exported in ONNX format for cross-platform deployment. The library includes a configuration system for repeatable model building and serializable provenance tracking for production model management.