Drools is a rule engine, DMN engine and complex event processing (CEP) engine for Java.

a Business Process Management (BPM) Suite

Errai

Drools and jBPM integration with seam, spring, camel, ...

Camel Kafka Connector allows you to use all Camel components as Kafka Connect connectors

The common API for Drools and jBPM

Maven, ant, eclipse, ... plugins and support for Drools, jBPM and Guvnor functionality

Lienzo Structure Graphics GWT Toolkit

Dependency Injection and html templates framework for J2CL. Relaxed implementation of Jakarta CDI

DMN model API written in Java.

jBPM Form Builder (Archive)

RedHat Managed Services APIs for Java

GuvnorNG Playground