... I send out a list of most interesting libraries and apps in the "Java" section to about 1100 subscribers.
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MIT Deep Learning Book in PDF format (complete and parts) by Ian Goodfellow, Yoshua Bengio and Aaron Courville
Open Source Fast Scalable Machine Learning Platform For Smarter Applications: Deep Learning, Gradient Boosting & XGBoost, Random Forest, Generalized Linear Modeling (Logistic Regression, Elastic Net), K-Means, PCA, Stacked Ensembles, Automatic Machine Learning (AutoML), etc.
Stanford CoreNLP: A Java suite of core NLP tools.
PipelineAI Kubeflow Distribution
A machine learning software for extracting information from scholarly documents
Plugin to integrate Learning to Rank (aka machine learning for better relevance) with Elasticsearch
Java Statistical Analysis Tool, a Java library for Machine Learning
Easy Machine Learning is a general-purpose dataflow-based system for easing the process of applying machine learning algorithms to real world tasks.
MALLET is a Java-based package for statistical natural language processing, document classification, clustering, topic modeling, information extraction, and other machine learning applications to text.