Spring Framework - The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
OpenXava - OpenXava is a Web Java Framework for Rapid Development of Enterprise Applications.
JBoss - JBoss is Red Hats Java EE 5-compliant (soon Java EE 6-compliant) application server.
Jmix - Jmix is a high-level application development framework that you can use to build web apps.
Payara Server - Payara Server is a fully supported, developer-friendly, open source application server. Innovative, cloud-native, optimized for production deployments. Jakarta EE & MicroProfile compatible.