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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.
Spring Framework - The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform.
JBoss - JBoss is Red Hats Java EE 5-compliant (soon Java EE 6-compliant) application server.
ActiveJ - Alternative Java platform built from the ground up. It is minimalistic, boilerplate-free, and lightning-fast. ActiveJ has minimum third-party dependencies, yet features a full stack of technologies with an async programming model and powerful DI.
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.