Camunda - The Universal Process Orchestrator
OpenXava - OpenXava is a Web Java Framework for Rapid Development of Enterprise Applications.
jBPM - jBPM is a flexible Business Process Management (BPM) Suite.
jHipster - JHipster is a development platform to quickly generate, develop, & deploy modern web applications & microservice architectures.
ProcessMaker - ProcessMaker is an easy to use BPM and workflow software solution. It is used to design, automate, and deploy business processes of any kind.
Spring Framework - The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform.